Chronic Rhinosinusitis

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RxDrug of choiceIntranasal corticosteroids (e.g., fluticasone 2 sprays each nostril daily).

AltAlternativesLarge-volume saline irrigation; for CRSwNP, budesonide-added irrigations; biologics (dupilumab 300 mg q2w, mepolizumab 100 mg q4w, tezepelumab 210 mg q4w) for severe disease.

⊘AvoidRoutine oral corticosteroids for CRSsNP; systemic or topical antifungals; prolonged macrolide antibiotics; non-dihydropyridine CCBs (not relevant but avoid in asthma).

DxTest of choiceNasal endoscopy for diagnosis; non-contrast coronal CT (Lund-Mackay score ≥4) for surgical planning and confirmation if endoscopy equivocal.

ScKey scoreLund-Mackay CT score, SNOT-22 (MCID 8.9), Nasal Polyp Score (0-8), Modified Lund-Kennedy endoscopic score.

→When to referTo otolaryngology for ESS when symptoms persist despite 8-12 weeks of optimal medical therapy, or for biologic therapy in severe CRSwNP. Also refer for suspected complications (orbital, intracranial).

CRS management is phenotype- and endotype-driven: intranasal steroids and saline irrigation are first-line, surgery for medically refractory cases, and biologics for severe type 2 disease. Avoid unnecessary antibiotics and antifungals.

Chronic rhinosinusitis (CRS) is a chronic inflammatory condition of the sinonasal mucosa lasting ≥12 weeks, affecting 18.8-23.3 per 1000 population [35]. It is classified by phenotype (CRSwNP with nasal polyps, CRSsNP without) and endotype (type 2 vs non-type 2), which guide management [5][19]. Anatomically, it involves the osteomeatal complex and paranasal sinuses [17][29].

Overview and Recommendations

Background

•CRS affects approximately 5% of the adult population, with significant geographic variation, and is defined by persistent inflammation of the sinonasal mucosa lasting 12 weeks or longer. The disease is not a single entity but encompasses distinct phenotypes, CRS with nasal polyps (CRSwNP) and without (CRSsNP), that differ in pathophysiology, clinical presentation, and treatment response.
•The underlying inflammatory endotype determines disease behavior: type 2 inflammation (driven by IL-4, IL-5, IL-13, and epithelial alarmins like TSLP) dominates CRSwNP and is associated with eosinophilia, polyps, and comorbid asthma or NSAID intolerance. Non-type 2 CRS (Th1/Th17) is more common in CRSsNP and may be linked to neutrophilic inflammation.
•CRS carries substantial morbidity, including olfactory dysfunction (up to 78% on objective testing), sleep disturbance, and a bidirectional relationship with depression and anxiety. Untreated, only 8% of patients achieve disease control, and the annual cost of care is high.
•Key modifiable risk factors include obesity (OR 1.33), smoking, and occupational exposures; asthma and allergic rhinitis are common comorbidities. Mendelian randomization has confirmed causal roles for sedentary time, depression, and GERD.
•The paradigm of CRS management has shifted from broad antimicrobial use to phenotype- and endotype-directed therapy, with biologics targeting specific inflammatory pathways for severe disease.

Evaluation

•Suspect CRS in any patient with two or more cardinal symptoms, nasal obstruction, anterior/posterior mucopurulent discharge, facial pain/pressure, or olfactory disturbance, persisting for ≥12 weeks.
•Ask about the duration and quality of facial pain (bilateral, dull ache worse with bending), severity of nasal congestion, and any fluctuation in smell. Also inquire about asthma, NSAID intolerance, and history of sinus surgery.
•Examine the nasal cavity with anterior rhinoscopy and, most importantly, nasal endoscopy to visualize the middle meatus, sphenoethmoidal recess, and olfactory cleft. Endoscopic findings of polyps, mucopurulent discharge, or mucosal edema confirm the diagnosis.
•Document the endoscopic severity using the Modified Lund-Kennedy score, which grades polyps, edema, and discharge on a 0-2 scale per side (total 0-12). The Nasal Polyp Score (0-4 per nostril) is used for polyp-specific assessment.
•Order a non-contrast coronal CT of the paranasal sinuses if endoscopy is not diagnostic or if surgical planning is needed. A Lund-Mackay score ≥4 is consistent with CRS; a score of 0 essentially excludes it.
•Assess for the eosinophilic endotype with blood eosinophil count (cutoff ≥0.16 × 10⁹/L has 85% sensitivity for eosinophilic CRS), total IgE, and fractional exhaled nitric oxide (FeNO). Tissue biopsy at surgery can confirm >70 eosinophils/HPF.
•Consider imaging for complications if there is unilateral disease, orbital signs, forehead swelling, or neurological symptoms. Contrast-enhanced CT or MRI is indicated for suspected fungal ball, neoplasm, or intracranial extension.
•Screen for associated conditions: in patients with nasal crusting, septal perforation, or saddle-nose, check c-ANCA for granulomatosis with polyangiitis. In children or adults with recurrent pneumonia, evaluate for cystic fibrosis (sweat chloride, CFTR genetics) or primary ciliary dyskinesia (nasal nitric oxide, genetics).
•Evaluate symptom burden with the SNOT-22 questionnaire; a clinically meaningful change is ≥8.9 points. Also assess sleep quality (Sleep-SNOT subdomain) and screen for depression (PHQ-2).
•Differentiate from other causes of nasal obstruction: allergic rhinitis, structural nasal obstruction, and odontogenic sinusitis (unilateral disease with foul odor should prompt dental evaluation).

Management

•Initiate first-line medical therapy with intranasal corticosteroids (e.g., fluticasone 2 sprays each nostril daily) and large-volume saline irrigation (≥150 mL per nostril once or twice daily). These are the cornerstone of treatment for all phenotypes.
•For patients with CRSwNP, consider adding high-volume steroid irrigations (e.g., budesonide 0.5 mg/2 mL in 240 mL saline twice daily) to reduce polyp size and improve symptoms; this is especially effective after surgery.
•Prescribe a short course of oral corticosteroids (e.g., prednisone 30-40 mg daily for 5-10 days) only for acute exacerbations of CRSwNP or allergic fungal sinusitis; avoid routine use in CRSsNP as it provides no benefit and increases adverse effects.
•For acute exacerbations (AECRS), use watchful waiting for mild cases; if antibiotics are prescribed, give amoxicillin with or without clavulanate 500-875 mg BID for 5-10 days. For recurrent or refractory cases, obtain culture-directed antibiotics via middle meatal swab.
•Refer for endoscopic sinus surgery (ESS) when symptoms persist despite 8-12 weeks of optimal medical therapy, or when complications (orbital abscess, Pott's puffy tumor, intracranial extension) are present. Do not require a predefined duration of medical therapy before considering surgery.
•Perform ESS using a graded approach; the LOEM system (Lamella Ostium Extent Mucosa) guides extent. Extended procedures (LOEM 3-4) reduce revision rates and improve symptom scores compared to limited surgery.
•In the perioperative period, continue saline irrigation and consider steroid-releasing sinus implants to reduce adhesions and polyp recurrence. Avoid routine postoperative oral corticosteroids in CRS without polyps.
•For patients with severe CRSwNP (high polyp burden, recurrence after surgery, or requiring systemic corticosteroids), initiate biologic therapy. First-line options include dupilumab 300 mg subcutaneously every 2 weeks, mepolizumab 100 mg every 4 weeks, or tezepelumab 210 mg every 4 weeks. These significantly reduce polyp size, improve smell, and lower the need for surgery.
•Monitor response to biologics with SNOT-22, Nasal Polyp Score, and olfactory testing at 16-24 weeks. Discontinue if no improvement after 6 months; consider switching to another biologic if inadequate response.
•Avoid using systemic or topical antifungals for routine CRS, they show no benefit and increase adverse events. Do not prescribe macrolide antibiotics (e.g., clarithromycin) for CRS, as the MACRO trial found no benefit over placebo.
•Manage comorbidities: treat asthma and allergic rhinitis concurrently, refer for sleep study if Sleep-SNOT ≥17.5, and screen for pneumococcal antibody deficiency (consider PPSV23 vaccination if nonprotective titers).
•Counsel patients that CRS is a chronic condition: only 35-40% achieve well-controlled disease, and polyp recurrence after ESS is 35-40% at 18 months. However, biologics can achieve remission in up to 77% of patients.
•Discharge criteria for acute exacerbations: resolution of fever, improvement in pain, and no signs of orbital or intracranial complications. For planned surgery, ensure patient understands the need for postoperative irrigations and follow-up.

Board Review — High Yield

•Type 2 inflammation, Dominates CRSwNP; driven by IL-4, IL-5, IL-13; responds to dupilumab, mepolizumab, tezepelumab.
•Lund-Mackay score ≥4, Radiographic criterion for CRS on CT.
•Modified Lund-Kennedy score, Preferred endoscopic grading system; excludes scarring/crusting, highest reliability.
•SNOT-22 MCID, ≥8.9 points defines clinically meaningful change.
•Dupilumab 300 mg q2w, Most effective biologic for CRSwNP in network meta-analysis.
•MACRO trial, Clarithromycin no better than placebo for CRS; ESS superior to continued medical therapy alone.
•EPOS 2020 uncontrolled CRS, ≥3 of: symptoms, rescue medication, mucosal disease in the prior month.
•Pott's puffy tumor, Frontal bone abscess with intracranial involvement in 38% of adults; requires urgent surgical drainage.
•CFTR modulators (elexacaftor-tezacaftor-ivacaftor), First-line for CRS in cystic fibrosis; improve sinonasal and pulmonary outcomes.
•Biologic therapy reduces surgery need, Tezepelumab reduced surgery rate to 0.5% vs 22.1% placebo in WAYPOINT trial.

Deep Dive — Evidence Details

Definition, Classification and Anatomic Localization

▸CRS defined by ≥12 weeks of sinonasal inflammation; classify by phenotype (polyps) and endotype (type 2 vs non-type 2)
▸Disease control per EPOS: controlled, partially controlled, uncontrolled

HY High Yield: Classify CRS by both phenotype (polyps vs no polyps) and endotype (type 2 vs non-type 2) to guide therapy.

CRS is chronic inflammation of sinonasal mucosa lasting ≥12 weeks ^[5]^A1c^[19]^A1c. Anatomically centered on the osteomeatal complex (maxillary sinus ostium, ethmoid infundibulum, middle meatus) ^[17]^D5. Classification is dual: phenotype (CRSwNP vs CRSsNP) and endotype (type 2 vs non-type 2) ^[5]^A1c^[17]^D5^[19]^A1c. EPOS classification includes primary diffuse, primary local, secondary CRS (e.g., CF, PCD) ^[14]^D5^[17]^D5. Disease control is categorized as controlled, partially controlled, or uncontrolled ^[14]^D5. Prevalence is 18.8-23.3 per 1000, incidence 2.5 per 1000/year ^[35]^B2b. Underutilization of intranasal steroids is a quality gap ^[40]^B2b. Pearl: When evaluating a patient with CRS, routinely classify by both phenotype (polyps vs no polyps) and endotype (type 2 vs non-type 2), this directly predicts response to intranasal steroids, biologics, and surgical extent ^[5]^A1c^[17]^D5^[30]^D5.

Classification of Chronic Rhinosinusitis Phenotypes

Phenotype	Key Feature	Endotype/Associated Marker
CRSsNP	No visible polyps	Non-type 2 (mixed Th1/Th17)
CRSwNP	Bilateral polyps	Type 2 (IL-4, IL-5, IL-13, IgE, periostin)
AECRS	Transient worsening to baseline	Often type 2
Primary diffuse CRS	Bilateral, non-localized	Type 2 or non-type 2
Primary local CRS	Unilateral, functional unit	Often non-type 2
Secondary CRS	Underlying systemic disease	Variable (CF, PCD, immunodeficiency)

Pathophysiology and Mechanism

▸Type 2 inflammation (IL-4, IL-5, IL-13) drives CRSwNP; non-type 2 (Th1/Th17) drives CRSsNP
▸S. aureus superantigens and biofilms are key contributors to severity and treatment resistance

HY High Yield: Endotype dictates treatment response: biologics target type 2 (IL-4/IL-5/IL-13), while non-type 2 requires different strategies.

CRS driven by distinct inflammatory pathways: type 2 (IL-4, IL-5, IL-13, IgE) dominates CRSwNP; non-type 2 (Th1/Th17, IFN-γ, IL-17) is associated with CRSsNP ^[17]^D5^[50]^A1a. Epithelial barrier dysfunction releases alarmins (TSLP, IL-25, IL-33) activating ILC2s and Th2 cells ^[50]^A1a^[87]^D5. Microbial dysbiosis: S. aureus superantigens increase odds of CRSwNP (OR 12.07) ^[54]^B3a; biofilms drive treatment resistance ^[69]^D5^[87]^D5. Causal risk factors: smoking (OR 1.15), asthma (OR 1.45), allergic rhinitis (OR 4.77), BMI (OR 1.05) ^[82]^B2c. Tissue remodeling involves periostin, MMP-9, and NLRP3 inflammasome ^[52]^D5^[67]^D5^[84]^D5. The immune hyperresponsiveness hypothesis posits dysregulated response to commensal microbes ^[72]^B3b. Pearl: The clinical distinction between CRSwNP and CRSsNP is driven by underlying endotype, type 2 inflammation (IL-4/IL-5/IL-13, alarmins, eosinophilia) dictates polyp formation and predicts response to biologic therapy, while non-type 2 CRS requires different management strategies targeting neutrophilic or mixed pathways.

Key Mediators and Pathways in Chronic Rhinosinusitis Pathophysiology

Mediator / Pathway	Key Role in CRS	Endotype Association
IL-4, IL-5, IL-13	Eosinophil activation, IgE class switching, goblet cell metaplasia	Type 2 (CRSwNP)
TSLP, IL-25, IL-33	Epithelial alarmins → ILC2/Th2 activation	Type 2
IFN-γ, IL-17	Neutrophil recruitment, epithelial barrier disruption	Non-type 2 (CRSsNP)
Periostin	Matricellular protein, biomarker of type 2 remodeling	Type 2 (eosinophilic)
S. aureus superantigens	Polyclonal IgE, T-cell activation, severity	CRSwNP
NLRP3 inflammasome	IL-1β/IL-18 release, pyroptosis, mucosal inflammation	Both endotypes
Short-chain fatty acids	Suppress TSLP, reduce eosinophil survival	Potential therapeutic target in ECRS

Epidemiology, Etiology and Risk Factors

▸Obesity (OR 1.33), asthma (OR 1.45), and smoking (OR 1.15) are major modifiable risk factors
▸Bidirectional relationship with depression and anxiety: CRS increases risk and vice versa

HY High Yield: Screen for modifiable risk factors: smoking, obesity, asthma, GERD. Address to improve CRS outcomes.

CRS prevalence is 4.3-10.4% in adults, incidence 2.5 per 1000/year ^[35]^B2b^[112]^B2a. Female sex increases odds of CRSsNP (OR 1.44 age <60) but decreases CRSwNP (OR 0.63) ^[114]^C4. Allergic fungal rhinosinusitis disproportionately affects Black patients (58.0%) ^[93]^A1a. Key modifiable risk factors: obesity (OR 1.33) ^[48]^A1a, asthma (OR 1.45) ^[82]^B2c, GERD (OR 1.36) ^[127]^B2b, smoking (causal OR 1.15) ^[82]^B2c. Bidirectional associations with depression (HR 1.40) and anxiety (HR 2.79) ^[113]^B2b. CRS increases risk of new-onset asthma (OR 1.74), bronchiectasis (OR 1.87), COPD (OR 1.73), OSA (OR 1.91) ^[105]^B2b. Pediatric CRS linked to adenoiditis and immune deficiency ^[66]^D5. Pearl: Female sex predisposes to CRSsNP; male sex to CRSwNP; AFRS disproportionately affects Black and underinsured patients.

Key Risk Factors for Chronic Rhinosinusitis

Factor	Odds Ratio / Relative Risk	Evidence Level
Sibling with pediatric CRS	HR 57.5 (p<10⁻⁸) ^[122]^B2b	2b
Air pollution (NO₂, SO₂, PM₂.₅)	Increased outpatient visits ^[110]^B2c	2c
H. pylori in sinonasal tissue	Detected in 37.1% of polyps ^[108]^B3a	3a

Clinical Presentation

▸CRSsNP: more facial pain; CRSwNP: more olfactory loss and polyp recurrence
▸Unilateral symptoms: consider odontogenic, fungal, or autoimmune causes

! Warning: Orbital swelling, diplopia, vision changes require immediate surgical referral.

Cardinal symptoms: nasal obstruction, mucopurulent discharge, facial pain/pressure, olfactory disturbance for ≥12 weeks ^[133]^A1c. Facial pain more prominent in CRSsNP (56.4% moderate/severe) vs CRSwNP (29.8%) ^[91]^A1a. Olfactory dysfunction is underappreciated: prevalence 30-78% on validated testing ^[95]^A1a; worse in CRSwNP (mean TDI difference 8.7 points) ^[159]^C4. Taste dysfunction affects 28-34% ^[164]^C4^[2]^B2a. Sleep disturbance and depression are common: 24.4% screen positive on PHQ-2 ^[158]^B2b. Phenotypic variants: AERD (triad of CRSwNP, asthma, NSAID hypersensitivity) ^[138]^B2a^[152]^D5; AFRS (young adults, mean age 27.7, male predominance, eosinophilic mucin) ^[167]^C4; odontogenic sinusitis (unilateral, foul odor, dental pathology) ^[20]^A1c^[163]^B3b; CF-CRS (polyps in 50-60%) ^[53]^D5^[155]^B2a; GPA (nasal crusting, septal perforation, saddle-nose, PR3-ANCA positive) ^[156]^C4. Red flags: unilateral symptoms, orbital signs, intracranial pressure elevation ^[153]^D5. Pearl: Patients with CRSsNP present with more prominent facial pain and pressure than those with CRSwNP, but the latter have worse olfactory loss and higher polyp recurrence after surgery. A unilateral presentation should always trigger a search for dental, fungal, or autoimmune causes.

Phenotypic Variants of Chronic Rhinosinusitis

Variant	Key Features	Frequency / Notes
CRS without nasal polyps (CRSsNP)	Bilateral facial pain/pressure more prominent; less severe smell loss; moderate to severe pain in 56%	Most common phenotype ^[91]^A1a
CRS with nasal polyps (CRSwNP)	Severe nasal obstruction, anosmia, less pain (moderate in 30%); polyp recurrence after ESS in 35-40% at 6-18 months	Type 2 inflammation; prior ESS and worse preoperative polyposis predict recurrence (OR 2.6 and 1.4) ^[121]^B2b
Aspirin-exacerbated respiratory disease (AERD)	Triad of CRSwNP, asthma, NSAID hypersensitivity; polyps regrow rapidly; anosmia early	0.3-0.9% of population; surgery improves symptoms but medical therapy is essential ^[138]^B2a^[152]^D5
Allergic fungal rhinosinusitis (AFRS)	Unilateral or bilateral polyps with eosinophilic mucin; often in young adults; mean age 27.7 years; male predominance (52%)	Aspergillus flavus most common (32.8%); recurrence rate 19.4% after surgery ^[167]^C4
Odontogenic sinusitis (ODS)	Unilateral maxillary sinusitis; foul odor; unilateral purulent discharge; dental pathology on imaging	Requires dental referral; microbes and Th1 cytokine profile (IFNγ, TNFα, IL-6, IL-8 elevated) ^[20]^A1c^[163]^B3b
Cystic fibrosis CRS (CF-CRS)	Nasal polyps in 50-60%; hyposmia/anosmia common; often bilateral pansinusitis; neutrophilic inflammation	CFTR modulators improve sinonasal outcomes ^[53]^D5^[155]^B2a
Granulomatosis with polyangiitis (GPA)	Nasal crusting, epistaxis, septal perforation, saddle-nose deformity; subglottic stenosis; PR3-ANCA positive in >85%	Destructive lesions predict renal involvement; misdiagnosis as CRS is common ^[156]^C4

Audiologic, Vestibular and Endoscopic Assessment

▸Nasal endoscopy is essential for diagnosis and monitoring; use MLK score for serial assessment
▸Endoscopic scores correlate weakly with patient-reported outcomes; depression confounds

HY High Yield: Use Modified Lund-Kennedy score (polyps, edema, discharge) for serial endoscopic assessment; it correlates with symptom subscore.

Diagnostic nasal endoscopy is the cornerstone, with sensitivity 0.87 and specificity 0.63 against CT ^[168]^C4. Endoscopic findings: polyps, mucopurulent discharge, mucosal edema, obstruction of middle meatus ^[133]^A1c^[135]^A1c. Modified Lund-Kennedy (MLK) score (grades polyps, edema, discharge, 0-2 each) has highest reliability and correlates with SNOT-22 symptom subscore ^[160]^B2b. Nasal Polyp Score (NPS) 0-8 is primary endpoint in biologic trials; dupilumab improved NPS by -2.25 vs omalizumab at 24 weeks ^[179]^A1b. Olfactory Cleft Endoscopy Scale (OCES) predicts retronasal olfaction ^[180]^C4. Endoscopic scores correlate weakly with quality of life; depression confounds patient-reported outcomes ^[183]^C4^[158]^B2b. Audiologic assessment: tympanometry indicated when otitis media with effusion suspected; 22.8% of severe CRSwNP have pathological tympanometry ^[120]^A1b. Biologic therapy (mepolizumab, dupilumab) improves ear symptoms ^[120]^A1b^[170]^C4. Vestibular assessment not routine; dizziness warrants alternative diagnoses. Pearl: When assessing a patient with CRS, perform nasal endoscopy at the initial visit and at each follow-up to document the presence and severity of polyps, edema, and discharge using the Modified Lund-Kennedy score, this provides a reliable, serial objective measure that correlates with treatment response and predicts escalation risk, but never rely on endoscopy alone to judge patient-perceived disease control, as psychological comorbidity is a major confounder.

Comparison of Nasal Endoscopy Scoring Systems for Chronic Rhinosinusitis

Scoring System	Components	Score Range	Key Features
Lund-Kennedy (LK)	Polyps, edema, discharge, scarring, crusting	0-20 (each side 0-10)	Widely used; scarring and crusting have poor reliability
Modified Lund-Kennedy (MLK)	Polyps, edema, discharge	0-12 (each side 0-6)	Excludes scarring/crusting; best inter-rater reliability and correlation with SNOT-22 ^[160]^B2b
Nasal Polyp Score (NPS)	Polyp size 0-4 per nostril	0-8	Standard in biologic trials; primary endpoint in EVEREST ^[179]^A1b
Olfactory Cleft Endoscopy Scale (OCES)	Inflammation of olfactory cleft	0-4 (per side)	Independent predictor of retronasal olfaction ^[180]^C4
Perioperative Sinus Endoscopy (POSE)	Postoperative cavity appearance	Variable	Used in surgical outcome studies; less common in routine care

Diagnostic Imaging, Tissue Sampling and Workup

▸CT (Lund-Mackay ≥4) is diagnostic but correlates weakly with symptoms; endoscopy is preferred first-line
▸Blood eosinophil count ≥0.16×10⁹/L is a strong predictor of eosinophilic CRS

HY High Yield: Blood eosinophil count ≥0.16×10⁹/L: sensitivity 84.9%, specificity 84.4% for eosinophilic CRS.

CT is gold-standard imaging: Lund-Mackay score (LMS) ≥4 confirms disease ^[208]^B3b^[217]^B2b. Sensitivity 0.90, specificity 0.50 against histopathology ^[168]^C4. CT correlates weakly with symptoms (r=0.434 with SNOT-22) ^[193]^B2a. MRI reserved for complications or unilateral disease ^[206]^B2a. Endoscopy has high sensitivity (0.87), moderate specificity (0.63) ^[168]^C4. Tissue biopsy: ≥70 eosinophils/HPF is gold-standard for eosinophilic CRS ^[221]^B3b^[222]^B3b; systemic steroids reduce count (mean difference -36.57 cells/HPF) ^[224]^B2a. Preoperative steroids should be withheld if biopsy planned. Laboratory studies: blood eosinophil count ≥0.16×10⁹/L or ≥2.05% predicts ECRS (sensitivity 84.9%, specificity 84.4%) ^[230]^C4; total IgE elevated in AFRS ^[219]^B3b; FeNO higher in ECRS (mean difference 32.21 ppb) ^[207]^B3a; c-ANCA for GPA ^[156]^C4; CFTR analysis for CF ^[194]^B2a; nasal NO for PCD ^[151]^D5. Diagnostic algorithm: Step 1: confirm objective inflammation (endoscopy or CT). Step 2: classify by polyp presence. Step 3: assess endotype (blood eosinophils, IgE, FeNO). Step 4: MRI for asymmetric disease. Step 5: ANCA for concerning features. Step 6: test for PCD/CF in children or adults with recurrent infections ^[151]^D5^[194]^B2a. Pearl: The Lund-Mackay CT score is the gold-standard imaging measure, but it correlates only weakly with symptoms; never rely on CT alone to diagnose CRS, the clinical history and endoscopic findings must align ^[193]^B2a.

Diagnostic Laboratory Tests for Chronic Rhinosinusitis Subtyping

Test	Finding	Utility
Blood eosinophil count	≥0.16 × 10⁹/L or ≥2.05%	Predicts ECRS (sensitivity 84.9%, specificity 84.4%) ^[230]^C4
Serum total IgE	Elevated	Supports AFRS or type 2 phenotype ^[219]^B3b
Serum 25-hydroxyvitamin D	<61.8 nmol/L	Independent risk factor for ECRSwNP (OR 3.074, P = 0.04) ^[229]^B3b
Fractional exhaled nitric oxide (FeNO)	Pooled mean difference 32.21 ppb higher in ECRS vs non-ECRS	Noninvasive diagnostic tool for ECRS (diagnostic odds ratio 8.78) ^[207]^B3a
Periostin (serum)	Elevated	Correlates with eosinophilic inflammation and CT severity; adds to eosinophil count ^[34]^A1a
c-ANCA (PR3)	Positive	Screens for granulomatosis with polyangiitis (GPA) when nasal crusting, septal perforation, or saddle-nose deformity present ^[156]^C4
CFTR mutation analysis	Pathogenic variants	Indicated when CRS is accompanied by male infertility, bronchiectasis, or recurrent pancreatitis, especially in children ^[66]^D5^[194]^B2a
Nasal nitric oxide (nNO)	Low	Screening test for primary ciliary dyskinesia (PCD) ^[151]^D5

Severity, Staging and Risk Stratification

▸EPOS 2020 uncontrolled disease: ≥3 criteria (symptoms, rescue meds, endoscopic findings) in prior month
▸Polyp recurrence after ESS: 35-40% at 18 months; prior ESS doubles risk

HY High Yield: SNOT-22: clinically meaningful change ≥8.9 points. Use as primary patient-reported outcome.

Lund-Mackay CT score (0-24) is most widely used radiographic staging, but correlates weakly with symptoms (r=0.434 with SNOT-22) ^[193]^B2a. Modified Lund-Kennedy (MLK) endoscopic score has highest reliability and correlates with SNOT-22 symptom subscore ^[160]^B2b. Nasal Polyp Score (NPS) 0-8 is primary endpoint for biologics; dupilumab shows mean difference -3.1 vs placebo at 24 weeks ^[233]^A1b. SNOT-22 (0-110): clinically meaningful change ≥8.9 points ^[232]^B2b. EPOS 2020 disease control criteria: uncontrolled if ≥3 of following in prior month: (1) nasal blockage/rhinorrhea/facial pain/smell loss/sleep disturbance; (2) rescue medication use in last 6 months; (3) mucosal disease on endoscopy ^[254]^B3b. 40% of CRS patients meet uncontrolled criteria; mucus EDN level is independent predictor (OR 1.323) ^[254]^B3b. Risk factors: asthma, OSA, obesity, blood eosinophils >0.16×10⁹/L, TAS2R38 polymorphisms ^[44]^A1a^[242]^B3b^[238]^B3b^[12]^B3b^[230]^C4. Polyp recurrence after ESS: 35% at 6 months, 40% at 18 months; prior ESS (OR 2.6) and worse preoperative polyposis (OR 1.4) predict recurrence ^[121]^B2b. Smoking cessation improves symptoms over 10-20 years ^[240]^C4. Pearl: The Modified Lund-Kennedy endoscopic score (excluding scarring and crusting) has the highest reliability and correlation with patient-reported outcomes, making it the preferred tool for serial clinical assessment ^[160]^B2b.

Risk Stratification Factors in CRS

Factor	Impact on CRS Severity	Evidence
Asthma	Significant risk factor for uncontrolled status and eosinophilic CRS (ECRS) ^[242]^B3b	OR for ECRS: not reported; uncontrolled rate higher in NP+AS (p < 0.05) ^[242]^B3b
OSA	Higher odds of ESS (OR 1.91), antibiotic use (OR 1.90), and steroid use (OR 2.23) ^[238]^B3b	Propensity-matched cohort: P < 0.0001
Obesity	RR 1.23 for new-onset CRS at 1 year ^[12]^B3b; aRR 1.44 for new-onset asthma in CRS patients ^[249]^B3b	TriNetX cohort, 1:1 matching
Blood eosinophils	Cutoff >0.16 × 10⁹/L (sensitivity 84.9%, specificity 84.4%) for diagnosing ECRS ^[230]^C4	ROC AUC 0.873
TAS2R38 polymorphisms	Associated with poorer outcomes after ESS ^[44]^A1a	Meta-analysis of 4 trials
Cystic fibrosis carriers	Increased risk of CRS, more severe disease, higher antibiotic use ^[250]^B3b	Population-based cohort

Acute and Emergency Management

▸Pott's puffy tumor: forehead swelling, fever, headache; intracranial involvement in 38.1%
▸Uncomplicated AECRS: watchful waiting first; amoxicillin ± clavulanate if antibiotics needed

! Warning: Orbital or intracranial signs require urgent contrast-enhanced CT and surgical consultation.

AECRS: transient worsening of symptoms returning to baseline ^[26]^C4. Common pathogens: S. aureus (MSSA 22.5%), H. influenzae (11.9%) ^[126]^B2a. Emergency presentations: orbital complications (proptosis, ophthalmoplegia, vision loss); Pott's puffy tumor (forehead swelling, fever, headache; intracranial involvement in 38.1%) ^[279]^C4; intracranial extension (altered mental status, focal deficits). Obtain contrast-enhanced CT or MRI. Empiric antibiotics for Pott's puffy: cephalosporin, metronidazole, nafcillin; duration ~61 days ^[279]^C4. Surgical intervention required in 87.3% of Pott's puffy cases ^[279]^C4. For uncomplicated AECRS: watchful waiting is initial therapy; if antibiotics needed, amoxicillin ± clavulanate for 5-10 days ^[133]^A1c^[135]^A1c. Intranasal corticosteroids and large-volume saline irrigation (≥150 mL) improve symptoms ^[199]^A1a^[201]^A1a. Culture-directed antibiotics if no improvement in 7 days ^[282]^C4. Avoid systemic antifungals and topical amphotericin B (no benefit, hepatotoxicity risk) ^[202]^A1a. Pearl: For any CRS patient presenting with forehead swelling, fever, or orbital signs, obtain contrast-enhanced CT urgently, Pott's puffy tumor complicates sinusitis in 0.5-1% of cases, and intracranial involvement is present in nearly 40% of adult cases ^[279]^C4.

Empiric Antibiotic Regimens for AECRS and Suppurative Complications

Clinical Scenario	First-Line Regimen	Duration	Evidence Level
Uncomplicated AECRS (mild-moderate)	Watchful waiting or amoxicillin ± clavulanate	5-10 days	AAO-HNS 2015 ^[133]^A1c (1c)
Uncomplicated AECRS (severe)	Amoxicillin-clavulanate 875/125 mg PO BID	5-10 days	AAO-HNS 2015 ^[133]^A1c (1c)
Pott's puffy tumor / orbital infection	Cephalosporin + metronidazole + nafcillin IV	~61 days (mean)	Case series ^[279]^C4 (4)
Recurrent AECRS with prior culture change	Culture-directed antibiotics after endoscopic culture	7-14 days	Cohort ^[282]^C4 (4)

Medical versus Surgical Management (Definitive)

▸Biologics (dupilumab, tezepelumab, mepolizumab) are effective for severe CRSwNP; macrolides show no benefit
▸ESS improves QoL significantly; recurrence common (35-40% at 18 months); perioperative biologics may help

Rx Drug of Choice: Dupilumab 300 mg SC every 2 weeks: highest-ranked biologic for NPS, SNOT-22, and nasal congestion.

Surgery considered when patients have subtypes least likely to benefit from continued medical therapy: CRSwNP, polyps with bony erosion, eosinophilic mucin, fungal balls ^[134]^A1c. No predefined medical therapy duration required before surgery ^[134]^A1c. Medical options: topical corticosteroids (first-line; high-volume steroid irrigations more effective than sprays) ^[292]^D5^[324]^D5; saline irrigation improves QoL (RSDI MD 13.5 points) ^[201]^A1a. Biologics for severe uncontrolled CRSwNP: dupilumab ranked highest in network meta-analysis (NPS MD -1.85, SNOT-22 MD -12.56) ^[291]^A1a; tezepelumab comparable (NPS and NCS) with lower surgery rate (0.5% vs 22.1%; HR 0.02) ^[143]^A1b^[308]^A1a; mepolizumab improved SNOT-22 by -35.3 points at 12 months ^[330]^B2b; depemokimab (twice-yearly) reduced NPS (integrated treatment difference -0.7) ^[294]^A1b. Macrolides: MACRO trial showed no benefit over placebo for SNOT-22 ^[295]^A1b. Oral corticosteroids: reduce polyp size but no benefit in CRSsNP after ESS ^[205]^A1a^[140]^A1b. Topical antibiotics not recommended routinely; antifungals no benefit ^[202]^A1a^[288]^D5. ESS improves SNOT-22 with large effect sizes (Cohen's d >1.0) ^[314]^B2b. Polyp recurrence after ESS: 35% at 6 months, 40% at 18 months ^[121]^B2b. Revision rates vary (mean 10.6%) ^[313]^B2b. Perioperative dupilumab improves olfactory outcomes ^[104]^A1b. Pearl: For CRSwNP, ESS provides rapid and sustained improvement in quality of life and polyp reduction, but recurrence is common; combining surgery with biologics (dupilumab, mepolizumab) or high-volume steroid irrigations improves long-term outcomes, especially in patients with large polyps or type 2 inflammation ^[162]^B2b^[290]^A1b^[336]^B2a.

Comparative Efficacy of Biologics for CRSwNP (Network Meta-Analysis)

Biologic	NPS MD vs Placebo (95% CI)	SNOT-22 MD vs Placebo (95% CI)	NCS MD vs Placebo (95% CI)	SUCRA (NPS)
Dupilumab	-1.85 (-2.47 to -1.24)	-12.56 (-22.49 to -2.63)	-0.84 (-1.08 to -0.59)	0.92
Omalizumab	-1.30 (-1.90 to -0.70)	Not significant	-0.51 (-0.83 to -0.19)	,
Mepolizumab	-1.48 (-2.22 to -0.74)	Not significant	Not significant	,
Benralizumab	-0.84 (-1.66 to -0.03)	Not significant	Not significant	,
Tezepelumab (52 wk)	Comparable to dupilumab	Comparable to dupilumab	Comparable to dupilumab	,

Data from ^[291]^A1a and ^[308]^A1a. MD = mean difference; NPS = nasal polyp score; NCS = nasal congestion score; SUCRA = surface under the cumulative ranking curve.

Dosing Table for Key Medical Therapies in CRS

Drug	Starting Dose	Target/Max Dose	Renal Adjustment	Hepatic Adjustment	Key Monitoring
Budesonide (high-volume irrigation)	0.5 mg/2 mL added to 240 mL saline BID	Same	None	None	IOP, HPA axis (long-term)
Dupilumab	300 mg SC every 2 weeks	Same	None	None	Eosinophil count, injection site reactions
Mepolizumab	100 mg SC every 4 weeks	Same	None	None	Eosinophil count, hypersensitivity
Tezepelumab	210 mg SC every 4 weeks	Same	None	None	Injection site reactions
Depemokimab	100 mg SC every 26 weeks	Same	None	None	Eosinophil count
Clarithromycin (macrolide)	250 mg PO BID for 2 weeks, then 250 mg daily for 10 weeks	Same	Reduce dose if CrCl <30	Caution in hepatic impairment	QT interval, GI side effects

Doses from [label] and pivotal trials ^[235]^A1b^[143]^A1b^[294]^A1b^[295]^A1b.

History and Evolution of Treatment

▸ESS has demonstrated clinical effectiveness for medically refractory CRS, whereas clarithromycin was no better than placebo in the MACRO trial. [363]
▸Mepolizumab reduces repeat-surgery risk and improves polyp, symptom, smell, and quality-of-life outcomes in previously operated CRSwNP. [451]
▸Biologic selection and switching are increasingly guided by response criteria, comorbid disease, and longitudinal outcomes rather than by a single baseline marker. [377] [457]
▸Cumulative corticosteroid exposure should be actively assessed because adrenal and skeletal complications are relevant in CRS with coexisting airway disease. [455]
▸Persistent, unilateral, paediatric, cystic-fibrosis-associated, or systemic-disease-associated CRS requires evaluation for a specific underlying cause. [151] [375] [458] [461] [463]

CP Clinical Pearl: A history of prior polyp surgery does not preclude benefit from mepolizumab; benefit was observed in patients with one or more previous surgeries. [451]

! Warning: Twice-yearly depemokimab and real-world dupilumab asthma data are not direct evidence for CRS treatment and should not be extrapolated without CRS-specific evidence. [362] [459] [376]

Dx Diagnostic Essentials: Consider primary ciliary dyskinesia when CRS coexists with chronic lung disease, recurrent otitis, laterality abnormalities, or reduced fertility; diagnosis requires multiple tests. [151]

From empiric medical therapy to evidence-based escalation

Treatment of chronic rhinosinusitis (CRS) has progressively shifted from predominantly symptom-directed medical care toward phenotype-specific, multimodal management. Recent evidence from the MACRO randomised controlled trial indicates that endoscopic sinus surgery (ESS) was clinically effective for appropriately selected, medically refractory patients, whereas clarithromycin was no better than placebo; qualitative interviews nevertheless identified implementation barriers affecting acceptance of these results. ^[363]^D5 ESS can also produce substantial improvements in olfaction and sinonasal quality of life in chronic rhinosinusitis with nasal polyps (CRSwNP): in a prospective study, mean SNOT-22 scores fell from 57 ± 20 preoperatively to 15 ± 14 at 3 months, although the mean score increased to 25 ± 19 by 6 months. ^[462]^C

The modern role of surgery is therefore increasingly complementary rather than necessarily definitive. In CRSwNP, the need for repeated surgery has encouraged development of long-term anti-inflammatory and biologic strategies. In the phase III SYNAPSE programme, mepolizumab, administered every 4 weeks with standard care for 52 weeks, reduced the need for repeat surgery and improved endoscopic polyp scores, nasal obstruction, loss of smell, overall symptoms, and SNOT-22 outcomes in patients with one or more previous nasal-polyp surgeries. ^[451] Real-world prospective data similarly report high response rates to dupilumab and mepolizumab in severe CRSwNP, with response assessed using the EPOS/EUFOREA 2023 framework and incorporating polyp burden, SNOT-22, symptoms, and olfaction. ^[377]^B2b

Emergence of biologic treatment

Biologics have expanded treatment beyond repeated systemic corticosteroids and surgery for severe, uncontrolled CRSwNP. Omalizumab has also shown benefit in a previously less well-defined group: adults with moderate CRSwNP, mild-to-moderate IgE-mediated asthma, and no previous sinus surgery. In a 59-patient randomised open-label study followed for 12 months, omalizumab plus standard therapy was compared with standard therapy alone, with nasal-polyp score as the primary outcome and additional assessment of nasal obstruction, asthma control, exacerbations, and systemic corticosteroid use. ^[452]

Treatment selection is evolving from a one-biologic-fits-all approach. A multicentre prospective cohort found predictors of response to dupilumab or mepolizumab, although the evidence remains observational and guidance on choosing between agents is limited. ^[377]^B2b Conversely, a tertiary-centre retrospective series found that 18% of 400 biologic-treated patients switched biologics after a mean of 38 months, highlighting incomplete response or loss of response as practical issues in long-term care. ^[457] Mepolizumab treatment has also been associated with changes in systemic type 2 and non-type 2 cytokine profiles in patients with severe eosinophilic asthma, CRSwNP, or eosinophilic granulomatosis with polyangiitis, supporting—but not by itself proving—the value of biomarker-informed treatment. ^[456]

Steroid stewardship and treatment delivery

The biologic era has also emphasised cumulative corticosteroid toxicity. Among patients with CRSwNP and/or global airway disease referred for biologic assessment, investigators measured systemic, inhaled, and nasal corticosteroid exposure alongside adrenal and bone outcomes, including secondary adrenal insufficiency and osteopenia or osteoporosis. ^[455] These findings support reducing avoidable systemic exposure while maintaining effective topical therapy. Adherence to intranasal corticosteroids remains a treatment determinant: a crossover trial evaluated a metered-dose-inhaler adaptor intended to reduce post-nasal drip and nasal irritation in allergic rhinitis and postoperative CRS, symptoms commonly associated with poor compliance. ^[453]

Patient-centred treatment has become more prominent. Psychological dysfunction can influence the relationship between symptoms and computed-tomography findings and affects outcomes after ESS; a prospective cohort followed SNOT-22 outcomes for 5 years to examine this effect. ^[454] Treatment planning should therefore incorporate symptom burden, quality of life, psychological factors, objective disease, and comorbid airway disease rather than relying on imaging alone. ^[454]

Precision care for associated and secondary CRS

The historical progression toward personalised care includes recognition of disease-specific mechanisms and causes. In eosinophilic CRSwNP, spatial transcriptomic and single-cell analyses identified subepithelial ALOX15-positive macrophage niches and an ALOX15–ERK–CCL13 pathway associated with eosinophil recruitment, suggesting future macrophage- or pathway-directed therapies beyond currently available biologics. ^[460]^C Environmental prevention is also gaining attention: long-term exposure to traffic- and industry-related pollutants, including nitrogen dioxide and benzene, was investigated in relation to CRS risk and sinonasal cytokine expression. ^[71]^B3b

Unilateral CRS requires aetiological assessment before routine escalation. A prospective surgical study found dental-origin pathology and dentally related anatomical variants among patients undergoing ESS for medically refractory unilateral CRS, supporting multidisciplinary dental evaluation when odontogenic disease is possible. ^[461]^C In cystic fibrosis, revision ESS is more frequent and occurs sooner than in patients without cystic fibrosis; retrospective data are examining whether elexacaftor/tezacaftor/ivacaftor triple-modulator therapy reduces the likelihood of revision surgery. ^[458]

In children, treatment evolution is linked to earlier identification of persistent disease and underlying disorders. A 5-year prospective study of preschool children evaluated clinical and multi-omics predictors of persistent CRS and house-dust-mite allergic rhinitis. ^[375]^B2b Primary ciliary dyskinesia should be considered when CRS occurs with progressive lung disease, recurrent otitis, laterality defects, or reduced fertility; the joint ERS/ATS diagnostic guideline emphasises that diagnosis requires multiple tests because clinical presentation is heterogeneous. ^[151]^D5 CRS may also accompany systemic vasculitis, including eosinophilic granulomatosis with polyangiitis, and respiratory phenotypes can evolve over time. ^[463]^C

Finally, ultra-long-acting biologics such as depemokimab have demonstrated twice-yearly dosing and sustained efficacy in type 2 asthma, but the cited evidence is asthma-specific and should not be interpreted as direct evidence for CRS treatment. ^[362]^A1a Real-world dupilumab studies in severe type 2 asthma likewise support its airway-wide role, but remain indirect evidence when treating CRS itself. ^[459] ^[376]^B2b

Contemporary treatment evolution

Treatment phase	Current evidence and implications
Medical therapy and antibiotics	Clarithromycin was no better than placebo in MACRO; topical corticosteroid delivery and adherence remain important. ^[363]^D5 ^[453]
ESS	Effective in appropriately selected medically refractory CRS; improves symptoms, quality of life, and often olfaction. ^[363]^D5 ^[462]^C
Biologics	Mepolizumab, dupilumab, and omalizumab support phenotype- and severity-based escalation, including selected moderate disease. ^[451] ^[452] ^[377]^B2b
Long-term disease control	Monitor biologic response, switching, cumulative corticosteroid toxicity, psychological factors, and comorbid airway disease. ^[455] ^[454] ^[457]
Precision and aetiological care	Address PCD, cystic fibrosis, dental disease, pollutants, allergic disease, and systemic vasculitis when clinically indicated. ^[151]^D5 ^[375]^B2b ^[458] ^[461]^C ^[71]^B3b ^[463]^C

Surgical Technique, Approaches and Perioperative Care

▸Use CT-based, endotype-aware planning and individualize the extent of ESS; the available randomized comparison of limited versus full FESS enrolled patients with SNOT-22 ≥30, bilateral polyp score ≥4, and modified Lund–Mackay score ≥14 [206][466].
▸Crushing and resection of concha bullosa both improved outcomes at 1 year in the available randomized study, but the supplied abstract does not establish comparative superiority [465].
▸The pooled restenosis proportion across Draf IIb and Draf III procedures was 9% (95% CI 5–14%); endotype may influence interpretation [327].
▸Postoperative corticosteroid therapy was associated with reduced polyp recurrence and improved SNOT-22 outcomes compared with ESS alone [336].
▸Avoid excessive controlled hypotension because systemic hypoperfusion and neurological, renal, or hemodynamic complications are potential risks [277].
▸Use biologics, vitamin D supplementation, dressings, or PNN neurectomy selectively because the supplied evidence does not establish universal perioperative indications [296][308][325][328][464][472].

HY High Yield: After ESS for CRSwNP, surgery should be integrated with sustained anti-inflammatory management and follow-up rather than treated as a definitive standalone intervention [336][469].

! Warning: Controlled hypotension requires careful patient selection and monitoring; excessive blood-pressure reduction may cause systemic, neurological, or renal complications [277].

Role and selection of endoscopic sinus surgery

Endoscopic sinus surgery (ESS), including functional endoscopic sinus surgery (FESS), remains an established operative treatment for CRS when symptoms and objective disease persist despite appropriate medical therapy; recent studies continue to evaluate how much surgery is required and which adjuncts improve healing and long-term control ^[328]^A1a^[466]. Surgical planning should be individualized according to phenotype or endotype, anatomical obstruction, radiographic distribution, prior surgery, polyp burden, and the need to create durable access for topical postoperative therapy ^[206]^B2a^[466]. High-resolution CT is central to operative mapping, assessment of disease extent and remodeling, and evaluation of orbital or intracranial complications; cone-beam CT may be useful in selected settings, while MRI can provide additional soft-tissue characterization ^[206]^B2a.

In severe, uncontrolled CRSwNP, the AirGOs Operative randomized trial compared limited with full FESS in patients meeting all of the following criteria: SNOT-22 ≥30, bilateral nasal polyp score ≥4, modified Lund–Mackay score ≥14, and previous surgery or systemic medication for CRSwNP ^[466]. The trial assessed change in SNOT-22 at 12 and 24 months, providing direct evidence for comparing operative extent, although the supplied abstract does not report the comparative outcome estimates ^[466]. Thus, the smallest operation that provides adequate disease clearance, ventilation, access, and postoperative topical-treatment delivery remains a reasonable operative principle, but the optimal extent cannot be inferred from the abstract alone ^[466].

Management of specific anatomical and frontal sinus disease

Concha bullosa can be treated during FESS by crushing or resection. In a prospective randomized study of 62 patients, 52 completed 1-year follow-up: 30 underwent crushing and 22 underwent resection ^[465]. The primary endpoint was 1-year SNOT-22 change, with synechiae severity and middle-meatus access as secondary endoscopic outcomes; the supplied abstract indicates improvement in both groups but does not provide the between-group estimates ^[465]. Either approach may therefore be considered according to lateral-wall stability, obstruction, mucosal preservation, and surgeon experience, without claiming superiority from the available data ^[465].

For frontal sinusotomy, a meta-analysis comparing Draf IIb and Draf III included 38 studies, with pooled analyses of 1,550 restenosis and 1,305 revision outcomes ^[327]^B2a. Across both procedures, the pooled restenosis proportion was 9% (95% CI, 5–14%); endotype-stratified results should be considered when selecting the approach because the analysis specifically evaluated type 2 versus non-type 2 disease ^[327]^B2a. The supplied abstract does not report the complete comparative revision estimates, so procedure selection should not be based on an assumed difference in restenosis or revision risk ^[327]^B2a.

Adjunctive procedures

Endoscopic posterior nasal nerve (PNN) neurectomy combined with FESS has been evaluated in a multicenter, randomized, assessor-blinded trial of 60 patients with CRSwNP, randomized equally to PNN neurectomy plus FESS or FESS alone ^[325]^A1b. Outcomes included VAS, total nasal symptom score, SNOT-22, and serum interleukins 4 and 5 at 3, 6, and 12 months. At 12 months, symptom scores improved significantly in both groups; the supplied abstract does not provide the complete comparative effect estimates or establish routine superiority of combined treatment ^[325]^A1b. PNN neurectomy should therefore be reserved for carefully selected patients in whom the additional therapeutic target is clinically justified ^[325]^A1b.

Hemostasis, dressings, and wound care

Controlled hypotension is used during FESS to reduce bleeding and improve endoscopic visibility, but excessive blood-pressure reduction may cause hemodynamic instability, neurological impairment, renal dysfunction, or systemic hypoperfusion ^[277]^D5. It should consequently be individualized by the anesthesia team, with attention to baseline cardiovascular, cerebrovascular, and renal risk; deliberate hypotension should not be treated as risk-free simply because it may improve the surgical field ^[277]^D5.

Chitosan-based nasal packs and gels have been studied as postoperative adjuncts because of proposed hemostatic and anti-adhesive properties ^[328]^A1a. A systematic review and meta-analysis of randomized trials assessed ostial-area preservation and wound-healing outcomes against no treatment, standard care, or other biomaterials ^[328]^A1a. These products may be considered where compatible with the operative goals and local practice, but the supplied abstract does not provide pooled effect sizes or establish a universal preferred product ^[328]^A1a.

Postoperative anti-inflammatory treatment and surveillance

Postoperative corticosteroid therapy is an important component of CRSwNP care. A meta-analysis of eight studies involving 776 patients found that ESS plus corticosteroid therapy was associated with lower polyp recurrence than ESS alone (OR 0.57, 95% CI 0.33–0.97), better SNOT-22 outcomes (SMD −1.09, 95% CI −1.30 to −0.89), and additional reported benefits in the abstract ^[336]^B2a. Continued local corticosteroid treatment and structured endoscopic follow-up are therefore appropriate after surgery, particularly in polyp disease ^[336]^B2a.

Recurrence is heterogeneous. Tissue-based research has identified an innate-myeloid inflammatory axis associated with rapid post-FESS CRSwNP recurrence, defined as recurrence within 1 year, compared with slow or absent recurrence defined as more than 2 years without recurrence ^[469]. These findings support risk-adapted surveillance but do not yet define a validated routine biomarker-guided surgical protocol ^[469].

Biologics may be relevant when disease remains uncontrolled after surgery or when surgery and corticosteroids are insufficient. Tezepelumab has been assessed in three randomized trials involving 655 patients with CRSwNP, with outcomes including polyp score, congestion, and SNOT-22; indirect comparisons also evaluated other biologics and ESS, but these comparisons are not substitutes for head-to-head perioperative trials ^[296]^A1a^[308]^A1a. Dupilumab has demonstrated benefit in a phase 3 trial of allergic fungal rhinosinusitis, improving Lund–Mackay CT score at 52 weeks versus placebo (least-squares mean difference −7.36, 95% CI reported in the study) ^[472]. Real-world data also evaluated mepolizumab-associated healthcare utilization and procedures after treatment initiation, although the supplied abstract does not provide the complete numerical results ^[468]. Prior ESS did not form a basis for withholding dupilumab in real-world treatment evaluation, but the supplied abstract does not provide the full adjusted outcome estimates ^[473].

Vitamin D has been investigated in relation to CRS severity, recurrence, quality of life, inflammatory markers, and postoperative outcomes in a systematic review and meta-analysis; however, the supplied abstract does not provide the pooled postoperative estimates or establish supplementation as standard perioperative treatment ^[464]. Serum vitamin D and cytokine associations have also been examined prospectively in CRSwNP and CRSsNP, but these findings are observational and should not be used alone to determine surgical timing or extent ^[471]^C. Psychological dysfunction may influence symptom interpretation and long-term quality-of-life outcomes after ESS; a prospective cohort followed SNOT-22 outcomes for 5 years, supporting preoperative assessment of psychological and symptom domains alongside CT and endoscopy ^[454].

Evidence-informed operative and perioperative considerations

Domain	Current evidence	Practical implication
Operative extent	Limited versus full FESS is being tested in severe CRSwNP; complete comparative results are not supplied ^[466]	Individualize extent to disease, anatomy, access, and postoperative treatment delivery ^[206]^B2a^[466]
Concha bullosa	Crushing and resection were compared in a randomized 1-year study; both groups improved ^[465]	Select according to obstruction, stability, mucosal preservation, and expertise ^[465]
Frontal sinusotomy	Pooled restenosis across Draf IIb and III was 9% (95% CI 5–14%) ^[327]^B2a	Consider endotype and disease pattern; avoid assuming one approach is universally superior ^[327]^B2a
Postoperative care	ESS plus corticosteroids reduced recurrence (OR 0.57) and improved SNOT-22 ^[336]^B2a	Maintain anti-inflammatory topical therapy and endoscopic surveillance ^[336]^B2a
Hemostasis	Controlled hypotension may improve visibility but can compromise organ perfusion ^[277]^D5	Use individualized anesthetic targets and risk assessment ^[277]^D5
Dressings	Chitosan products were evaluated for ostial preservation and wound healing ^[328]^A1a	Consider selectively; no universal product recommendation is established ^[328]^A1a

Complications

▸Consider recurrent or persistent disease, olfactory dysfunction, postoperative pain, bleeding, impaired healing, infection, crusting, and adhesions when monitoring CRS and ESS outcomes. [410][476][479]
▸Repeated systemic glucocorticosteroid courses carry short- and long-term adverse-effect risks, and no universally accepted safe cumulative exposure threshold has been established. [478]
▸CRS with recurrent ear disease, progressive lung disease, laterality defects, reduced fertility, or recurrent pneumonia should prompt evaluation for primary ciliary dyskinesia, cystic fibrosis, or another systemic disorder. [151][278][477]
▸Granulomatosis with polyangiitis is an important CRS mimic because upper-airway disease may precede renal involvement. [156]
▸Empty nose syndrome is associated with high reported rates of depression and anxiety: **76.6%** and **77.0%**, respectively, in the available meta-analysis. [107]

! Warning: Do not assume refractory CRS is uncomplicated sinonasal inflammation: systemic clues, recurrent pneumonia, immunosuppression, renal findings, or progressive pulmonary disease warrant evaluation for an underlying disorder or CRS mimic. [151][156][278][404][477]

CP Clinical Pearl: Psychological symptoms after extensive turbinate surgery may reflect empty nose syndrome, in which perceived obstruction occurs despite a patent airway. [107]

Sinonasal and postoperative complications

Chronic rhinosinusitis (CRS) may be complicated by persistent nasal obstruction, rhinorrhea or post-nasal drainage, facial pain or pressure, olfactory dysfunction, recurrent disease, and impaired quality of life; these outcomes are commonly measured with symptom scores, endoscopy, computed tomography, and the 22-item Sinonasal Outcome Test. ^[417]^A1a^[475]^[479] Olfactory impairment may also reflect exposure-related mucosal injury: a prospective study of 97 surgical patients with CRS, nasal polyposis, or septal deviation evaluated nasal heavy-metal accumulation alongside olfaction, airflow, and histopathology, supporting environmental toxicants as a possible contributor to sinonasal and olfactory morbidity. ^[480]

Endoscopic sinus surgery (ESS) can be followed by pain, bleeding, mucosal or histopathological injury, impaired healing, infection, crusting, adhesions, and recurrent inflammatory disease; the available trials specifically assessed postoperative pain, bleeding, healing-related outcomes, and postoperative complications. ^[410]^A1b^[476]^[479] In an 80-patient randomized trial, local bupivacaine injection involving the sphenopalatine ganglion and anterior ethmoid nerve was investigated to reduce postoperative pain and systemic analgesic requirements. ^[410]^A1b A small randomized within-person trial of 13 patients found that 42 °C saline irrigation during ESS was evaluated for intraoperative haemostasis, operative-field quality, histopathological effects, and postoperative complications, but its limited sample size prevents firm conclusions about safety. ^[476]

Middle-turbinate management may influence postoperative safety, although a meta-analysis of 25 studies involving 4,314 cases found no significant difference between middle-turbinate resection and preservation in SNOT-22, olfactory improvement, or Lund–Kennedy endoscopic scores. ^[399]^B2a Postoperative nasal irrigation is used to support healing and symptom control after ESS for CRS with nasal polyps; a randomized study compared isotonic 0.9% saline with hypertonic 2.3% saline containing algal extracts, assessing obstruction, secretion or post-nasal discharge, and sense of smell. ^[479] Mucoactive eucalyptol, limonene, and pinene capsules combined with intranasal corticosteroids were studied for 12 weeks after ESS in CRSwNP, including effects on ciliary function and inflammatory biomarkers; the evidence addresses treatment efficacy and safety rather than establishing a distinct complication. ^[475]

Treatment-related complications

Repeated or cumulative systemic glucocorticosteroid exposure is an important iatrogenic risk in inflammatory upper-airway disease. An EAACI task-force systematic review and meta-analysis evaluated short- and long-term adverse effects, including the potential dose-response relationship with daily and cumulative exposure; no universally accepted safe cumulative threshold has been established. ^[478] Intranasal corticosteroids may cause unpleasant administration effects such as post-nasal drip and nasal irritation, which can reduce adherence; a crossover trial evaluated a delivery adaptor intended to improve tolerability in allergic rhinitis and postoperative CRS. ^[453] An exhalation-delivery fluticasone system was developed to reach sinonasal regions above the inferior turbinate; a meta-analysis of five studies evaluated adverse effects as well as symptoms, polyp scores, quality of life, and surgical-indication rates. ^[417]^A1a

Vitamin D has been investigated as an immunomodulatory factor in CRS. A systematic review and meta-analysis assessed associations with disease severity, recurrence, quality of life, inflammatory markers, and postoperative outcomes, but the supplied evidence does not establish that supplementation prevents complications or recurrence. ^[464] Biologic therapy introduces the need for monitoring of treatment-related morbidity and inadequate response. In a retrospective cohort of 400 adults with CRSwNP, 70 patients (18%) switched biologics after a mean of 38 months, indicating that persistent or recurrent disease despite biologic therapy can lead to treatment changes. ^[457] In a real-world cohort of 21,249 dupilumab-treated patients with CRSwNP and/or asthma, investigators compared lymphoma, cardiovascular events, eosinophilia, joint pain, inflammatory arthritis, and sleep apnea with matched non-dupilumab and other-biologic groups; these outcomes should be considered when evaluating adverse events during biologic treatment. ^[482]

Lower-airway, genetic, and systemic complications

CRS may occur as part of a broader mucociliary or pulmonary disorder. Primary ciliary dyskinesia is characterized by chronic rhinosinusitis, recurrent middle-ear infections, progressive lung disease, laterality defects, and reduced fertility; delayed diagnosis can increase morbidity, so multisystem features should prompt structured diagnostic assessment. ^[151]^D5 Recurrent pneumonia in children is associated with substantial morbidity, hospitalization, and prolonged treatment; a systematic review of 3,440 children found underlying causes changed over time, emphasizing that recurrent lower-respiratory disease should not be attributed to CRS alone. ^[278]^C4

Immunosuppression may increase CRS risk or alter its course. A multisite retrospective cohort studied CRS development after kidney or liver transplantation and examined associations with immunosuppressive regimens and subsequent ESS. ^[404]^B2b Cystic fibrosis may also produce sinonasal disease and extrapulmonary treatment issues; a systematic review assessed the safety and extrapulmonary effects of elexacaftor–tezacaftor–ivacaftor after lung transplantation, where adverse effects and drug interactions remain clinically relevant. ^[477]

Important mimics and associated morbidity

Granulomatosis with polyangiitis can present with otolaryngologic findings resembling CRS, often before systemic symptoms; misdiagnosis may delay treatment and increase the risk of irreversible renal damage. ^[156]^C4 Inflammatory bowel disease is also associated with underrecognized ENT manifestations, including sinonasal involvement, and may complicate assessment of apparently refractory CRS. ^[165]^C4 Ambient air pollution has been associated with upper- and lower-airway inflammatory burden; an ecological US metropolitan-area study evaluated pollutant levels against outpatient CRS and asthma visits, supporting environmental exposure as a potential contributor to disease burden rather than proving individual causation. ^[481]

Extensive turbinate surgery can rarely contribute to empty nose syndrome, characterized by a subjective feeling of obstruction despite a patent nasal airway. A meta-analysis of 401 patients reported depression in 76.6% and anxiety in 77.0%; these findings highlight substantial psychological morbidity, although they do not establish causality or apply to all CRS patients. ^[107]^A1a

Prognosis and Natural History

▸CRS has a heterogeneous course; CRSwNP with severe type 2 inflammation, asthma, AERD/NSAID-exacerbated disease, eosinophilia, and previous surgery carries particular recurrence concern. [483][451][469]
▸Rapid postoperative recurrence may occur within **1 year**, while some patients remain recurrence-free for more than **2 years**. [469]
▸ESS plus nasal corticosteroids reduced polyp recurrence compared with ESS alone (OR **0.57**) in a meta-analysis of **776** patients. [336]
▸Mepolizumab reduced repeat-surgery risk in the phase III SYNAPSE program, including patients with prior nasal-polyp surgeries. [451]
▸Tissue inflammatory signatures, eosinophilic macrophage niches, blood-count-derived biomarkers, and prediction nomograms are being investigated for recurrence risk stratification. [469][460][486][489]
▸Childhood CRS, cystic-fibrosis-associated CRS, and CRS following orbital complications may have distinct long-term trajectories. [375][485][490]

! Warning: Recurrence estimates and biomarker-based predictions should not be treated as universally applicable: much of the new evidence is retrospective, subgroup-specific, or incompletely reported in the available abstracts. [469][486][489]

CP Clinical Pearl: Prognosis in severe CRSwNP should be assessed across sinonasal and lower-airway domains, including symptoms, olfaction, polyp burden, quality of life, asthma control, and systemic corticosteroid requirements. [330][483][484]

Overall course

Chronic rhinosinusitis (CRS) is a persistent inflammatory disorder that can substantially impair quality of life, and its clinical course is heterogeneous rather than uniform. ^[464] The greatest prognostic burden is described in chronic rhinosinusitis with nasal polyps (CRSwNP), particularly in patients with severe type 2 inflammation, asthma, aspirin- or NSAID-exacerbated respiratory disease, eosinophilia, and previous sinus surgery. ^[483]^[451]^[469] Recurrence after endoscopic sinus surgery (ESS) remains common, and some patients develop rapid postoperative recurrence within 1 year, whereas others remain recurrence-free for more than 2 years. ^[469]

Recurrence after surgery

The likelihood of recurrent disease is clinically important in patients with CRSwNP who have already undergone surgery. In the phase III SYNAPSE study, mepolizumab, administered every 4 weeks for 52 weeks with standard care, reduced the need for repeat surgery; a post hoc analysis specifically evaluated patients with one or more previous nasal-polyp surgeries. ^[451] The available evidence indicates that biologic therapy can improve endoscopic polyp burden, nasal obstruction, loss of smell, overall symptoms, and SNOT-22 outcomes in this high-risk population while delaying repeat surgery and/or systemic corticosteroid treatment. ^[451]

Tissue-level inflammatory features may help explain divergent postoperative trajectories. In a retrospective cohort of 91 patients, proteomic and ELISA analyses of polyp tissue were used to distinguish rapid recurrence within <1 year from slow or absent recurrence after >2 years without recurrence; the study investigated 69 inflammatory mediators and identified an innate-myeloid inflammatory axis associated with recurrence. ^[469] Mechanistic studies further implicated subepithelial ALOX15-positive macrophage niches and an ALOX15–ERK–CCL13 pathway in eosinophil recruitment in eosinophilic CRSwNP, a phenotype characterized by intense type 2 inflammation and high recurrence risk. ^[460]^C

Peripheral blood markers may provide additional risk stratification. In a retrospective cohort of 543 CRS patients undergoing ESS, long-term recurrence was evaluated using time-to-event methods incorporating absolute eosinophil count, eosinophil-to-leukocyte ratios, platelet- and monocyte-related indices, systemic immune-inflammation measures, red-cell distribution width, and clinical covariates. ^[486] A separate retrospective study developed and internally validated a nomogram for early postoperative polyp recurrence using 260 patients in a training cohort and 114 in internal validation; recurrence was defined within 6 months, with an additional external cohort of 242 patients. ^[489] These tools are promising for individualized prediction, but their retrospective design limits certainty about generalizability. ^[486]^[489]

Effect of continuing treatment on prognosis

Postoperative corticosteroid therapy appears to improve longer-term control in CRSwNP. A meta-analysis of 8 studies comprising 776 patients found that ESS combined with nasal corticosteroids reduced polyp recurrence compared with ESS alone (OR 0.57, 95% CI 0.33–0.97) and produced better SNOT-22 scores (SMD −1.09, 95% CI −1.30 to −0.89). ^[336]^B2a Steroid-eluting stents or implants are also being evaluated as adjuncts intended to improve postoperative healing and reduce recurrent disease; a systematic review identified 26 eligible studies, although the supplied abstract does not provide pooled effect estimates. ^[488]

In severe, uncontrolled CRSwNP, real-world 12-month treatment with mepolizumab was assessed prospectively in 96 adults. Outcomes included SNOT-22, symptom visual analogue scores, nasal-polyp scores, asthma control, and systemic corticosteroid use at baseline, 6 months, and 12 months. ^[330]^B2b The study supports assessment of both sinonasal and lower-airway outcomes when judging prognosis in patients with severe unified-airway disease. ^[330]^B2b Similarly, a retrospective matched study examined dupilumab after switching from other asthma biologics versus treatment in biologic-naïve patients with severe CRSwNP and asthma, addressing whether prior biologic exposure affects subsequent disease control. ^[487]

Meta-analysis of biologics in AERD evaluated upper- and lower-airway outcomes, including nasal-polyp score, congestion, SNOT-22, asthma measures, and treatment-related adverse events; however, AERD-specific randomized trials remain scarce. ^[483] Tezepelumab has likewise been studied as adjunctive therapy for CRSwNP, with outcomes including congestion, polyp score, olfaction, SNOT-22, FEV1, ACQ-6, and adverse events. ^[484] The supplied abstracts do not provide the complete numerical results, so the magnitude and durability of benefit cannot be quantified here. ^[483]^[484]

Special populations and disease persistence

In preschool children with CRS symptoms, a 5-year prospective multi-omics cohort enrolled 133 children aged 4–8 years, with 117 completing follow-up, to identify predictors of CRS persistence and house-dust-mite allergic rhinitis at school age. ^[375]^B2b This study highlights that childhood CRS may persist and that early clinical and molecular features may improve prognostic prediction, although the supplied abstract does not report the final predictor estimates. ^[375]^B2b

Cystic-fibrosis-associated CRS is another distinct trajectory. In children aged 6–18 years, a retrospective cohort assessed clinical, endoscopic, radiologic, functional, and laboratory outcomes before and 12 months after elexacaftor/tezacaftor/ivacaftor therapy, while also examining atopy and TAS2R38 polymorphisms. ^[485]^C Acute sinusitis with orbital complications in childhood does not necessarily end the disease course: a retrospective cohort of 181 children evaluated subsequent acute sinusitis, sinus surgery, and development of CRS, as well as factors associated with persistent or recurrent disease. ^[490]^C

Factors affecting long-term control

Adherence is a potentially modifiable determinant of outcome. A crossover trial in postoperative CRS participants compared standard fluticasone spray with a device designed to reduce postnasal drip and nasal irritation, enrolling 16 participants in the CRS group and using 3-week treatment periods. ^[453] Improved tolerability may support sustained intranasal corticosteroid use, although the study was small and was not designed to establish long-term recurrence reduction. ^[453]

Adjunctive therapies, including irrigation, physiotherapy, steroid-eluting implants, and dental interventions, have been synthesized in a meta-analysis of recurrent or chronic rhinosinusitis studies published from 2015–2025; the review assessed clinical and radiologic outcomes, but the supplied abstract does not provide the pooled estimates. ^[32]^A1a Local platelet-rich plasma was evaluated retrospectively in 120 CRSwNP patients undergoing FESS, comparing 60 treated and 60 control patients for epithelialization, endoscopic appearance, long-term recurrence, and quality of life. ^[119]^B2b

Finally, CRS may occur within systemic eosinophilic disease. A case report described an adolescent with chronic rhinosinusitis, eosinophilic asthma, and ANCA-positive eosinophilic granulomatosis with polyangiitis who achieved remission after benralizumab. ^[491]^C This is single-patient evidence and should not be generalized to routine CRS prognosis. ^[491]^C

Prognostic evidence from the updated literature

Clinical issue	Updated evidence	Interpretation
Postoperative recurrence	Rapid recurrence defined as <1 year versus slow/no recurrence after >2 years; tissue inflammatory mediators and myeloid signatures were investigated. ^[469]	Recurrence timing and tissue biology may support risk stratification.
Corticosteroid maintenance	ESS plus corticosteroids: OR 0.57 for polyp recurrence; SNOT-22 SMD −1.09. ^[336]^B2a	Continued anti-inflammatory therapy improves postoperative outcomes.
Prior surgery	Mepolizumab reduced repeat surgery need in severe CRSwNP, including patients with prior polyp surgeries. ^[451]	Recurrent disease can remain treatable despite surgical history.
Prediction tools	Cohorts of 543 and 260/114/242 patients evaluated blood biomarkers and a recurrence nomogram. ^[486]^[489]	Tools remain investigational because of retrospective designs.
Pediatric persistence	Five-year cohort: 133 enrolled; 117 completed follow-up. ^[375]^B2b	Early features may predict CRS persistence.

Prevention, Screening and Surveillance

▸Ask about secondhand smoke and occupational inhalational exposure, and provide exposure-reduction counseling. [441][450]
▸Consider immune evaluation and pneumococcal vaccination assessment in recurrent or refractory CRS, especially with nonprotective pneumococcal titers. [442][495]
▸Screen for OSA before ESS and assess psychiatric or sleep comorbidity when clinically indicated. [438][498]
▸Use urgent imaging and specialist assessment for frontal swelling, severe headache, neurologic findings, orbital signs, or rapid deterioration because of the risk of Pott's puffy tumor. [445]
▸Monitor prolonged or combined topical corticosteroid exposure for adrenal and ocular complications. [439][443]
▸After ESS, document symptoms, endoscopic findings, and clinically indicated imaging, including frontal sinus patency and quality-of-life outcomes. [492][493]

! Warning: Do not assume that long-term budesonide irrigation is systemically risk-free: hypocortisolism was detected in 21.8% of patients selected for stimulated cortisol testing after prolonged use. [439]

Dx Diagnostic Essentials: Pott's puffy tumor should be considered when CRS is accompanied by frontal swelling, severe headache, fever, orbital findings, or neurologic symptoms; urgent imaging is required. [445]

CP Clinical Pearl: SNOT-22 can support screening for OSA and psychiatric comorbidity, but disease-specific symptom scores should not substitute for formal diagnostic testing. [438][498]

Prevention and risk reduction

Prevention of chronic rhinosinusitis (CRS) should include assessment and reduction of avoidable environmental exposures. Secondhand tobacco smoke is a potentially preventable CRS risk factor, yet physician screening and counseling about exposure have been reported to be limited. ^[441]^B3b Occupational inhalational exposure should also be considered: among U.S. firefighters, World Trade Center exposure was associated with increased self-reported CRS diagnoses and current CRS symptoms compared with non-exposed firefighters. ^[450]^B2b Population data from Korea identified CRS in 6.95% of participants and evaluated sociodemographic and medical risk factors, supporting attention to modifiable comorbidity and exposure profiles during preventive care. ^[496]

Respiratory viral infection may contribute to exacerbations or persistent mucosal inflammation. In a prospective case-control study, respiratory viruses were detected by multiplex PCR in nasal lavage samples from 50.5% of patients with CRS and in turbinate epithelial samples from 64.0% of patients, indicating that viral surveillance has biological relevance, although these data do not establish a preventive antiviral intervention. ^[494] A large retrospective matched-cohort study found that COVID-19 infection was associated with increased risk of new-onset type 2 inflammatory disease, whereas COVID-19 vaccination was associated with a protective effect. ^[449]^B2b Rare case reports describe eosinophilic granulomatosis with polyangiitis temporally following mRNA-1273 vaccination; reported cases occurred within 14 days, but this evidence cannot establish causality and should not be interpreted as evidence against routine vaccination. ^[447]^C4

Immune evaluation and vaccination

Consider evaluation for antibody deficiency in adults with recurrent acute rhinosinusitis or CRS that is unusually frequent, severe, refractory, or associated with recurrent infections. Patients with chronic or recurrent sinusitis may have impaired vaccine responses despite normal serum immunoglobulin concentrations: in one small study, responses to diphtheria and tetanus vaccination were lower than in healthy controls, and 14 of 25 patients failed to reach the reported post-vaccination antibody threshold. ^[495] In adults aged 18–65 years with CRS or recurrent acute rhinosinusitis and nonprotective pneumococcal titers, subsequent 23-valent pneumococcal polysaccharide vaccination was studied for effects on sinusitis-related healthcare encounters, antibiotic prescriptions, and steroid prescriptions; the retrospective design limits causal interpretation. ^[442]^B2b

Screening for associated disease

Screen for obstructive sleep apnea (OSA), particularly before endoscopic sinus surgery (ESS), because approximately 20% of patients with CRS may have comorbid OSA and undiagnosed OSA may increase perioperative risk. ^[438]^B3b The sleep subdomain of the 22-item Sinonasal Outcome Test (Sleep-SNOT) was evaluated as a possible screening instrument in CRS patients undergoing ESS; it may help identify patients requiring formal OSA assessment, but it should not replace validated sleep-apnea evaluation or sleep testing. ^[438]^B3b

Psychological and sleep-related comorbidity should also be assessed when symptoms are disproportionate, persistent, or associated with impaired functioning. In a prospective cross-sectional study of patients awaiting CRS surgery, depression, anxiety, insomnia, and somatic symptom disorder were assessed using the PHQ-9, GAD-7, Insomnia Severity Index, PHQ-15, and SNOT-22; the study also examined whether SNOT-22 could predict these disorders. ^[498] These findings support targeted screening rather than assuming that sinonasal symptom severity alone defines inflammatory disease burden. ^[498]

Diagnostic surveillance and red flags

Persistent unilateral disease, atypical endoscopic findings, or a mass should prompt careful imaging, endoscopic reassessment, and tissue diagnosis when indicated. Respiratory epithelial adenomatoid hamartoma (REAH) is a non-neoplastic lesion that may occur with CRS and may involve the olfactory cleft or extra-olfactory regions; a 15-year pathology-confirmed series included 88 patients, with 55.7% having olfactory-cleft disease and 44.3% extra-olfactory disease. ^[76]^C4 Histopathologic confirmation is therefore important when the appearance is atypical or malignancy cannot be excluded. ^[76]^C4

Chronic sinonasal inflammation has been investigated as a possible precursor or risk marker for nasopharyngeal carcinoma and paranasal sinus malignancy. A U.S. SEER-Medicare case-control study evaluated adults aged 65 years or older with these malignancies, but an association does not establish that CRS causes cancer and does not justify population-based cancer screening solely for CRS. ^[444]^B3b

Fever, severe frontal headache, frontal swelling, neurologic symptoms, orbital findings, or rapid deterioration require urgent evaluation for complications. Pott's puffy tumor is frontal-bone osteomyelitis with a subperiosteal abscess and is rare but potentially life-threatening in children and adolescents; systematic-review evidence supports prompt diagnostic imaging, microbiologic assessment, and combined medical-surgical management when suspected. ^[445]^C4

Treatment safety and postoperative surveillance

Long-term topical corticosteroid therapy requires medication reconciliation and risk-based monitoring. In a follow-up cohort of 285 CRS patients undergoing stimulated cortisol testing after daily budesonide irrigation for a mean of 34 months, hypocortisolism was identified in 21.8% of tested patients. ^[439]^B2b Earlier long-term use of budesonide delivered by mucosal atomization was specifically evaluated for hypothalamic-pituitary-adrenal-axis effects and intraocular pressure. ^[443]^B2c Patients receiving prolonged or combined corticosteroid exposure should therefore be assessed for adrenal and ocular risk according to clinical context rather than presumed to be risk-free. ^[439]^B2b^[443]^B2c

After ESS, surveillance should combine symptoms, endoscopy, and imaging when clinically indicated. Biofilm-producing bacteria were prospectively studied in 48 patients with CRS with nasal polyposis over 12 months using Lund-Mackay CT scores, Lund-Kennedy endoscopy scores, and health-related quality-of-life measures; these data support monitoring objective disease and patient-reported outcomes, but do not establish routine biofilm-directed treatment. ^[492]^C Prospective evaluation after image-guided Draf 2a frontal sinusotomy showed follow-up of frontal sinus ostium patency and disease-specific quality of life at a mean of 10 months, illustrating the value of documenting both anatomic patency and functional outcome after frontal surgery. ^[493]

Controlled hypotension may reduce bleeding during ESS but excessive blood-pressure reduction can cause hemodynamic instability and potentially neurologic or renal ischemic complications. ^[277]^D5 Perioperative surveillance should therefore include individualized hemodynamic targets, continuous monitoring, and postoperative assessment for neurologic, renal, and cardiovascular complications rather than treating hypotension as universally benign. ^[277]^D5

Targeted screening and surveillance in CRS

Clinical context	Suggested action	Evidence
Recurrent or refractory CRS/RARS	Review infection history; consider immunoglobulin and vaccine-response assessment, including pneumococcal titers	^[442]^B2b^[495]
CRS before ESS, obesity, snoring, or sleep symptoms	Screen for OSA and arrange formal testing when indicated; Sleep-SNOT may assist triage	^[438]^B3b
Prolonged daily budesonide or multiple corticosteroid routes	Review cumulative exposure and consider adrenal and ocular monitoring	^[439]^B2b^[443]^B2c
Unilateral mass or atypical mucosa	Perform endoscopic reassessment, imaging, and biopsy when indicated to distinguish REAH and malignancy	^[76]^C4^[444]^B3b
Frontal swelling, severe headache, orbital or neurologic signs	Urgent imaging and multidisciplinary treatment for possible Pott's puffy tumor	^[445]^C4
Post-ESS follow-up	Assess symptoms, quality of life, endoscopy, and imaging when needed; document frontal ostium patency	^[492]^C^[493]

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