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Rheumatology›Condition·Updated Jul 11, 2026·v1

Giant Cell Arteritis

Giant cell arteritis is a granulomatous large-vessel vasculitis of the elderly, characterized by cranial and large-vessel phenotypes. It is an emergency due to risk of blindness and stroke. Diagnosis relies on clinical suspicion, ultrasound (halo sign), and temporal artery biopsy. Management begins with high-dose glucocorticoids; adjunctive tocilizumab or methotrexate reduces steroid exposure. Long-term complications include aortic aneurysm, infection, and glucocorticoid toxicity. Structured screening for aortic aneurysm and cardiovascular risk reduction is essential.

High Evidence319 references·2,799 words·12 min read·v1
giant cell arteritistemporal arteritisvasculitislarge-vessel vasculitisrheumatologyophthalmologyaortic aneurysmtocilizumabglucocorticoids

Quick Reference

RxDrug of choice[[prednisone]] 40-60 mg/day orally or IV for acute flare; for organ-threatening disease (visual loss), IV [[methylprednisolone]] 1 g/day for 3 days. Adjunctive [[tocilizumab]] 162 mg SC weekly with 26-week prednisone taper for sustained remission.
AltAlternatives[[methotrexate]] 15-25 mg PO/SC weekly; [[upadacitinib]] 15 mg PO daily; [[abatacept]] 10 mg/kg IV monthly; [[mavrilimumab]] 150 mg SC every 2 weeks (investigational).
⊘AvoidAnti-TNF agents (infliximab, adalimumab, etanercept); non-dihydropyridine CCBs (diltiazem, verapamil), exacerbate heart failure if present; live vaccines during high-dose immunosuppression; [[methotrexate]] in pregnancy (contraindicated).
DxTest of choiceHigh-resolution ultrasound of temporal and axillary arteries (halo sign), first-line imaging with 88% sensitivity and 96% specificity. Temporal artery biopsy if ultrasound equivocal or negative but high suspicion.
ScKey score2022 ACR/EULAR classification criteria: age ≥50 mandatory; score ≥6 points (positive biopsy/halo +5, ESR≥50 or CRP≥10 +3, sudden visual loss +3, +2 for each of morning stiffness, jaw/tongue claudication, new headache, scalp tenderness, temporal artery abnormality, bilateral axillary involvement, aortic FDG-PET activity).
→When to referUrgent rheumatology referral for all suspected GCA; same-day ophthalmology referral for acute visual loss; consider vascular surgery for large-vessel stenosis or aneurysm.
Giant cell arteritis is a medical emergency requiring immediate high-dose glucocorticoids to prevent blindness and stroke. Early use of steroid-sparing agents (tocilizumab or methotrexate) reduces cumulative glucocorticoid exposure and long-term morbidity. Aortic imaging at diagnosis and at 5 years is essential for detecting aneurysm.
Giant cell arteritis (GCA) is a granulomatous large-vessel vasculitis in adults ≥50 years, causing cranial ischemic symptoms, large-vessel inflammation, and systemic manifestations. It is a medical emergency due to risk of permanent vision loss, stroke, and aortic dissection. High-dose glucocorticoids are urgent first-line therapy; steroid-sparing agents (tocilizumab, upadacitinib) improve outcomes. This concise reference covers diagnosis, management, and surveillance for bedside use.

Overview and Recommendations

Background

  • •Giant cell arteritis (GCA) is a granulomatous large-vessel vasculitis that preferentially affects the aorta and its extracranial branches, occurring almost exclusively in adults aged 50 years and older. Also called Horton disease or temporal arteritis, it is now recognized as a spectrum including cranial and large-vessel phenotypes.
  • •The disease is a medical emergency because of its potential to cause permanent vision loss in 11-15% of patients, cerebrovascular ischemic events (pooled prevalence 4%), and aortic dissection (15-year relative risk 6.86 compared to the general population). Incidence peaks at 23.1 per 100,000 person-years in those aged 80-84 years, with a female predominance (female-to-male ratio ~2.5:1).
  • •Two main clinical phenotypes dominate: cranial GCA, which involves the temporal arteries and presents with headache, scalp tenderness, jaw claudication, and vision loss; and large-vessel GCA (LV-GCA), characterized by aortic, subclavian, and axillary artery inflammation, often presenting with limb claudication and constitutional symptoms. A mixed phenotype is also recognized, and a subset of patients with polymyalgia rheumatica (PMR) have subclinical GCA detected by imaging.
  • •The 2022 ACR/EULAR classification criteria (mandatory age ≥50 years) assign points for positive temporal artery biopsy or halo sign on ultrasound (+5), ESR ≥50 mm/hr or CRP ≥10 mg/L (+3), sudden visual loss (+3), and various clinical features (jaw claudication, new temporal headache, scalp tenderness, etc.) at +2 each. A cumulative score of ≥6 classifies a patient as having GCA, with sensitivity 87% and specificity 94.8%.
  • •The pathogenic cascade begins with activation of resident adventitial dendritic cells via Toll-like receptors, recruiting CD4+ T cells that polarize into Th17 cells (driven by IL-6, IL-1β, IL-23) and Th1 cells (driven by IL-12). The IL-6/Th17/IL-17 axis fuels systemic inflammation, while the IL-12/Th1/IFN-γ axis orchestrates granulomatous inflammation and vascular wall damage. The former is highly glucocorticoid-sensitive; the latter is steroid-resistant, explaining why high-dose corticosteroids rapidly suppress systemic symptoms but may not fully control vessel-wall inflammation.
  • •Risk factors include female sex, Northern European ancestry, age ≥70, and prior herpes zoster infection (especially ophthalmic). Type 2 diabetes is paradoxically protective (OR 0.75). Clonal hematopoiesis (DNMT3A, TET2 mutations) is present in 55-61% of GCA patients and may define a higher-risk subgroup.

Evaluation

  • •Suspect GCA in any patient ≥50 years with new-onset headache (especially temporal, unilateral or bilateral, aching or throbbing), scalp tenderness, jaw claudication (the single strongest clinical predictor), or unexplained constitutional symptoms (fever, weight loss, malaise).
  • •Ask about transient monocular vision loss (amaurosis fugax), diplopia, or sudden visual loss, these are ophthalmologic emergencies requiring immediate action. Also inquire about limb claudication (arms or legs) and symptoms of polymyalgia rheumatica (morning stiffness in shoulders, neck, hips).
  • •Examine the temporal arteries for tenderness, nodularity, thickening, or pulselessness; a firm, beaded cord is pathognomonic but often absent. Check for blood pressure asymmetry >10 mm Hg (suggests large-artery stenosis), and perform ophthalmologic examination (afferent pupillary defect, optic disc edema, pallor) if visual symptoms are present.
  • •Order urgent laboratory studies: ESR, CRP, complete blood count, and comprehensive metabolic panel. ESR ≥50 mm/hr or CRP ≥10 mg/L supports the diagnosis but up to 10% of biopsy-proven GCA patients have normal levels.
  • •Perform high-resolution ultrasound of the temporal and axillary arteries as the first-line imaging test (EULAR 2023 recommendation). The halo sign, a non-compressible, hypoechoic, concentric wall thickening, has pooled sensitivity 88% and specificity 96% for GCA. Scanning should occur within days of starting glucocorticoids, as the halo sign resolves within 2-4 weeks of therapy.
  • •If ultrasound is equivocal or negative but clinical suspicion remains high, proceed to temporal artery biopsy (TAB) or MRI of the scalp arteries. TAB has a sensitivity of only ~69% (giant cells, fragmentation of internal elastic lamina, mononuclear infiltration); a negative biopsy does not rule out GCA.
  • •Consider [18F]-FDG-PET/CT when large-vessel involvement is suspected or cranial imaging is equivocal. The GAPS study reported sensitivity 71% and specificity 91% against clinical diagnosis, with a negative predictive value of 98%. FDG-PET also detects incidental infections or malignancies and aortitis.
  • •Apply the 2022 ACR/EULAR classification criteria to standardize diagnosis: age ≥50 mandatory; positive TAB or halo sign (+5), ESR ≥50 or CRP ≥10 (+3), sudden visual loss (+3), morning stiffness in shoulders/neck (+2), jaw or tongue claudication (+2), new temporal headache (+2), scalp tenderness (+2), temporal artery abnormality on exam (+2), bilateral axillary involvement on imaging (+2), FDG-PET activity throughout aorta (+2). Score ≥6 classifies as GCA.
  • •Also consider alternative diagnoses: ANCA-associated vasculitis (check ANCA if atypical features like renal, pulmonary, or ENT involvement), VEXAS syndrome (consider in older men with treatment-refractory GCA-like symptoms, cytopenias, and bone marrow vacuoles), and other causes of headache or systemic inflammation.
  • •Assess disease activity using clinical examination and inflammatory markers. The OMERACT GCA Ultrasonography Score (OGUS) quantifies intima-media thickness and predicts relapse risk (IRR 1.85 per 1-point increase). For patients on tocilizumab, note that CRP normalizes rapidly regardless of disease activity, so clinical assessment is paramount.

Management

  • •For patients without visual loss or organ-threatening features, start 40-60 mg/day orally or IV equivalent. For patients with acute visual loss or amaurosis fugax, give IV 1 g/day for 3 days, followed by high-dose oral taper. Do not delay therapy for diagnostic tests, biopsy or imaging can be performed within 1-2 weeks of starting glucocorticoids without loss of diagnostic sensitivity.
  • •Begin glucocorticoid taper once the flare is controlled. The ACR 2021 guideline recommends a taper over 6-12 months; a 26-week taper is feasible when a steroid-sparing agent is used. Monitor for glucocorticoid adverse effects: blood glucose, blood pressure, bone density, and infection risk.
  • •Add a glucocorticoid-sparing agent in patients with refractory or relapsing disease, or those at high risk for glucocorticoid toxicity. First-line options: 162 mg SC weekly (or 8 mg/kg IV monthly) plus a 26-week prednisone taper, or 15-25 mg PO/SC weekly.
  • •Tocilizumab: In the GiACTA trial, sustained glucocorticoid-free remission at week 52 was 56% (weekly) vs 14% (placebo+26-week taper), NNT = 2.4. Continue for at least 12 months; after discontinuation, approximately 50% will relapse within 1-2 years. Monitor for neutropenia (hold if ANC <1000/μL), elevated transaminases (hold if >3× ULN), and hyperlipidemia (check lipid panel at 4-8 weeks, then every 6-12 months).
  • •Methotrexate: Modest glucocorticoid-sparing effect; less effective than tocilizumab. Monitor for toxicity, especially in elderly patients on diuretics, PPIs, or with low eGFR. Start with folic acid 1 mg daily to reduce toxicity.
  • •Alternative second-line agents: 15 mg PO daily with 26-week taper (SELECT-GCA: sustained remission 46.4% vs 29.0%, NNT 5.7; use with caution in patients with high cardiovascular risk); 10 mg/kg IV on days 1, 15, 29, then monthly (median remission duration 9.9 vs 3.9 months); 150 mg SC every 2 weeks (investigational, reduced flare risk by 62% in phase 2).
  • •Do not use anti-TNF agents (infliximab, adalimumab, etanercept), they have shown no benefit in GCA. Do not routinely use antiplatelet or anticoagulant therapy for GCA itself unless indicated for other reasons. Do not rely on CRP/ESR alone to guide therapy in tocilizumab-treated patients (92% of flares occur with normal CRP).
  • •Monitor for disease-driven complications: aortic aneurysm (2-fold risk; 4.5-fold faster growth than degenerative aneurysms), perform CT or MR angiography of thoracic aorta at diagnosis and at 5 years. Cerebrovascular events (3.96% of patients, predominantly vertebrobasilar), manage cardiovascular risk factors aggressively.
  • •Prevent glucocorticoid-induced osteoporosis: all patients starting ≥7.5 mg/day prednisolone for ≥3 months should receive calcium (1000-1200 mg/day), vitamin D (800 IU/day), and a bisphosphonate (alendronate 70 mg weekly or zoledronic acid 5 mg annually).
  • •Ensure vaccination: recombinant zoster vaccine (before or during glucocorticoid tapering, ideally ≥2 weeks before immunosuppression), annual influenza, pneumococcal, and SARS-CoV-2 boosters. Live-attenuated vaccines are contraindicated during high-dose immunosuppression.
  • •Refer to rheumatology urgently for all suspected GCA. For acute visual loss, refer to ophthalmology same day. Consider multidisciplinary care for large-vessel involvement (vascular surgery, cardiology). Discharge criteria: patient stable on therapy, no acute visual loss, and clear plan for glucocorticoid taper and monitoring.

Board Review — High Yield

  • •Jaw claudication, the single strongest clinical predictor of GCA; positive likelihood ratio >10.
  • •Halo sign on ultrasound, non-compressible, hypoechoic, concentric wall thickening of temporal/axillary arteries; sensitivity 88%, specificity 96%.
  • •2022 ACR/EULAR criteria, age ≥50 mandatory; score ≥6 = classify as GCA; positive TAB or halo sign = +5 points.
  • •IL-6/Th17 vs IL-12/Th1 axis, the former is glucocorticoid-sensitive (systemic inflammation), the latter is steroid-resistant (vessel wall damage); explains why tocilizumab targets IL-6 but relapses may occur via Th1 pathway.
  • •GiACTA trial, tocilizumab 162 mg SC weekly + 26-week prednisone taper: 56% sustained glucocorticoid-free remission at week 52 vs 14% with placebo; NNT 2.4.
  • •Aortic aneurysm risk, 2-fold increase in GCA; 4.5-fold faster growth than degenerative aneurysms; CT/MR angiography at diagnosis and 5 years.
  • •Tocilizumab safety, neutropenia, transaminitis, hyperlipidemia; monitor ANC, ALT/AST, lipids; hold if ANC <1000/μL or ALT >3× ULN.
  • •What NOT to do, do not use anti-TNF agents; do not use antiplatelet/anticoagulation for GCA alone; do not rely on CRP/ESR in tocilizumab-treated patients.
  • •VEXAS syndrome, consider in older men with treatment-refractory GCA-like symptoms, cytopenias, and bone marrow vacuoles (somatic UBA1 mutation).
  • •Vertebrobasilar stroke, 62.3% of cerebrovascular events in GCA; mortality doubled in patients with CVA (18% vs 8.8%).

Deep Dive — Evidence Details

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