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Internal MedicineCondition·Updated Apr 17, 2026·v1

Cushing Syndrome

Cushing syndrome is a complex endocrine disorder of chronic hypercortisolism that requires a stepwise diagnostic approach: confirmation of the biochemical state, followed by ACTH-based differentiation, and finally anatomical localization. Surgery is the definitive treatment, but medical management and aggressive supportive care for metabolic and thrombotic risks are essential for reducing high baseline mortality.

High Evidence82 references·324 words·2 min read·v1
EndocrinologyHypercortisolismPituitary AdenomaAdrenal IncidentalomaHypertension

Quick Reference

RxDrug of choiceOsilodrostat (medical); Hydrocortisone (post-op replacement)
AltAlternativesKetoconazole, Metyrapone, Mifepristone
AvoidRapid withdrawal of steroids without replacement; Ketoconazole in severe liver disease
DxTest of choice1-mg Dexamethasone Suppression Test (screening); IPSS (localization)
ScKey scorePadua Prediction Score (for VTE risk)
When to referRefer all suspected cases to Endocrinology for biochemical confirmation and localization.
Cushing syndrome is a life-threatening state of cortisol excess requiring surgical cure; medical therapy and VTE prophylaxis are vital adjuncts.
Cushing syndrome (CS) is a high-morbidity clinical state resulting from chronic, pathological exposure to excessive circulating glucocorticoids. It is broadly classified into ACTH-dependent forms (80-85%), primarily caused by pituitary adenomas (Cushing disease) or ectopic neuroendocrine tumors, and ACTH-independent forms (15-20%), typically arising from adrenal adenomas or carcinomas. The condition is characterized by a multisystemic impact, including resistant hypertension, type 2 diabetes, severe osteoporosis, and immune suppression.

Overview and Recommendations

Background

  • Define Cushing syndrome as the clinical manifestation of chronic hypercortisolism, which must be distinguished from iatrogenic causes (exogenous steroid use) and pseudo-Cushing states (e.g., severe obesity, chronic alcoholism, or major depression).
  • Distinguish between (CD), which refers specifically to a pituitary ACTH-secreting adenoma, and the broader Cushing syndrome, which includes adrenal and ectopic sources.
  • Recognize the high prevalence of mild autonomous cortisol secretion (MACS) in patients with adrenal incidentalomas (4-7% of the population over age 40), where subtle cortisol excess increases cardiometabolic risk without classic physical stigmata.
  • Identify the two main pathophysiological categories: ACTH-dependent (pituitary or ectopic) and ACTH-independent (adrenal adenoma, carcinoma, or bilateral hyperplasia), as this distinction dictates the entire diagnostic workup.
  • Note the significant female predominance (up to 3:1) in endogenous Cushing syndrome, with a peak incidence typically occurring between the ages of 30 and 50 years.
  • Understand the urgency of identifying 'Cushing's Crisis,' an endocrine emergency characterized by severe hypertension, profound hypokalemia, and acute psychosis, often seen in aggressive ectopic ACTH-secreting tumors.

Evaluation

  • Suspect Cushing syndrome in patients with 'red flag' features: proximal muscle weakness (difficulty climbing stairs), wide (>1 cm) purple striae, facial plethora, and supraclavicular fat pads, especially when these coexist with resistant hypertension or early-onset osteoporosis.
  • Screen high-risk populations even in the absence of classic signs, including those with difficult-to-control type 2 diabetes, hypertension requiring >3 medications, or adrenal incidentalomas discovered on imaging.
  • Rule out exogenous glucocorticoid use by taking a meticulous history of oral, inhaled, topical, and injectable steroids, including 'herbal' supplements that may be adulterated with dexamethasone.
  • Perform initial biochemical screening using one of three validated tests: a 24-hour urinary free cortisol (UFC), a late-night salivary cortisol (LNSC), or a 1-mg overnight suppression test (DST).
  • Interpret the 1-mg DST using a strict threshold: a serum cortisol >1.8 µg/dL (50 nmol/L) is considered a positive screen and requires further confirmatory testing.
  • Confirm the diagnosis with a second, different screening test if the initial result is abnormal, as cyclic Cushing syndrome or false positives from stress/medications can occur.
  • Measure plasma ACTH levels once hypercortisolism is confirmed; levels <5 pg/mL indicate ACTH-independent (adrenal) disease, while levels >20 pg/mL indicate ACTH-dependent disease.
  • Order a non-contrast CT of the adrenal glands if ACTH is suppressed to identify unilateral adenomas, large irregular masses suggestive of adrenal cortical carcinoma, or bilateral nodular hyperplasia.
  • Order a gadolinium-enhanced MRI of the pituitary if ACTH is elevated; however, be aware that up to 40% of corticotroph microadenomas are too small to be visualized on standard imaging.
  • Perform Inferior Petrosal Sinus Sampling (IPSS) with CRH or desmopressin stimulation if the pituitary MRI is negative or shows a lesion <6 mm, as this is the gold standard for differentiating CD from .
  • Evaluate for ectopic sources using high-resolution CT of the chest and abdomen or functional imaging (e.g., 68Ga-DOTATATE PET/CT) if IPSS suggests a non-pituitary source of ACTH.
  • Assess for complications at diagnosis, including a baseline DXA scan for bone density, screening for glucose intolerance, and a Padua Prediction Score for venous thromboembolism risk.

Management

  • Prioritize surgical resection of the primary tumor as the first-line treatment for all forms of endogenous Cushing syndrome, aiming for a complete biochemical cure.
  • Perform transsphenoidal surgery (TSS) for Cushing Disease, ideally by a high-volume pituitary surgeon, as initial remission rates are approximately 70-90% for microadenomas.
  • Execute a unilateral laparoscopic adrenalectomy for cortisol-secreting adrenal adenomas, which typically results in a permanent cure but requires postoperative steroid replacement.
  • Stabilize patients with Severe Cushing Syndrome (UFC >5x upper limit of normal) using parenteral Etomidate at a non-hypnotic dose of 0.03 mg/kg/hour IV, titrated to maintain serum cortisol between 500-800 nmol/L.
  • Initiate medical therapy with Osilodrostat (an 11β-hydroxylase inhibitor) starting at 2 mg BID, titrating every 1-2 weeks, for patients with persistent disease after surgery or those who are not surgical candidates.
  • Utilize Ketoconazole 200 mg TID (monitoring LFTs weekly) or Metyrapone 250 mg TID as alternative steroidogenesis inhibitors to achieve rapid biochemical control.
  • Administer Mifepristone 300-900 mg once daily for patients with hypercortisolism and type 2 diabetes; note that this drug blocks the glucocorticoid receptor and will increase circulating cortisol levels, making biochemical monitoring difficult.
  • Start thromboprophylaxis with Enoxaparin 40 mg SC daily immediately upon diagnosis of overt Cushing syndrome and continue for at least 3 months post-surgery to mitigate the 18-fold increased risk of VTE.
  • Manage glucocorticoid-induced osteoporosis with Alendronate 70 mg PO weekly or Zoledronic acid 5 mg IV annually, alongside Calcium 1200 mg and Vitamin D 2000 IU daily.
  • Implement immediate postoperative glucocorticoid replacement with Hydrocortisone 15-25 mg/day in divided doses (e.g., 10mg-5mg-5mg) to prevent adrenal crisis, as the contralateral adrenal or normal pituitary cells will be suppressed.
  • Monitor for 'steroid withdrawal syndrome'—characterized by severe joint pain, fatigue, and desquamation—which can occur even when replacement doses are physiologically appropriate.
  • Treat comorbid hypertension aggressively with ACE inhibitors or mineralocorticoid receptor antagonists (e.g., Spironolactone) if hypokalemia is present due to mineralocorticoid receptor crossover.
  • Refer patients with refractory Cushing Disease for pituitary radiotherapy or bilateral adrenalectomy if surgical and medical options fail, noting the risk of Nelson Syndrome (pituitary tumor progression) after adrenalectomy.
  • Discharge patients only after they are educated on 'sick day rules' for adrenal insufficiency and have a prescription for an emergency hydrocortisone injection kit.

Board Review — High Yield

  • Proximal muscle weakness — The most specific physical finding for Cushing syndrome compared to simple obesity.
  • Hypokalemic metabolic alkalosis — Highly suggestive of Ectopic ACTH Syndrome or Adrenal Cortical Carcinoma due to mineralocorticoid effects.
  • 1.8 µg/dL — The serum cortisol cutoff for a 'pass' on the 1-mg Dexamethasone Suppression Test.
  • Inferior Petrosal Sinus Sampling (IPSS) — The gold standard to distinguish a pituitary source (Cushing Disease) from an ectopic source.
  • Nelson Syndrome — Rapid enlargement of a pituitary corticotroph adenoma and hyperpigmentation following bilateral adrenalectomy.
  • Hyperpigmentation — Occurs only in ACTH-dependent forms (CD or EAS) due to MSH-like activity of ACTH precursors.
  • ARMC5 mutation — Associated with Primary Bilateral Macronodular Adrenal Hyperplasia (PBMAH).
  • 24-hour UFC — Can be falsely low in patients with renal impairment (GFR <30 mL/min).

Deep Dive — Evidence Details

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