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Ectopic Cushing Syndrome (Ectopic ACTH Syndrome)

Cortisol excess driven by an ACTH-secreting tumor outside the pituitary.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Endokrinoloji department. Book Appointment →

What is Ectopic Cushing Syndrome (Ectopic ACTH Syndrome)?

Ectopic Cushing syndrome is caused by non-pituitary tumors that autonomously secrete adrenocorticotropic hormone (ACTH), driving bilateral adrenal hyperplasia and severe hypercortisolism. It accounts for roughly 10-15% of ACTH-dependent Cushing syndrome.

Common sources include small-cell lung carcinoma (rapid, aggressive course), bronchial and thymic carcinoids (more indolent), pancreatic neuroendocrine tumors, medullary thyroid carcinoma and pheochromocytoma. Severity ranges from a fulminant metabolic emergency to a slowly progressive picture indistinguishable from Cushing disease.

Distinguishing ectopic from pituitary disease requires high-dose dexamethasone suppression testing, CRH stimulation and inferior petrosal sinus sampling, plus dedicated imaging with Ga-68 DOTATATE PET/CT for occult neuroendocrine tumors.

Symptoms

Severe muscle wasting and weakness
Refractory hypokalemia and metabolic alkalosis
Hyperpigmentation from very high ACTH
Marked hyperglycemia and new-onset diabetes
Severe hypertension and heart failure
Edema, opportunistic infections
Psychosis, depression, insomnia
Skin thinning and easy bruising rather than classic striae

Risk Factors

Small-cell lung carcinoma
Bronchial or thymic carcinoid
Pancreatic neuroendocrine tumor
Medullary thyroid carcinoma
Pheochromocytoma
MEN1 or other neuroendocrine syndromes
Heavy smoking history
Acute, severe hypercortisolism without classic Cushingoid habitus

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Rapidly progressive Cushingoid features
  • Severe unexplained hypokalemia or alkalosis
  • New-onset uncontrolled diabetes plus hypertension
  • Marked hyperpigmentation
  • Suspicious chest, mediastinal or pancreatic mass
  • Need for inferior petrosal sinus sampling and Ga-68 DOTATATE PET

Treatment Methods

01
Surgical resection of the ectopic ACTH-producing tumor (definitive)
02
Steroidogenesis inhibitors: ketoconazole, metyrapone, osilodrostat
03
Mifepristone for refractory hyperglycemia
04
Mitotane for occult or metastatic tumors
05
Bilateral adrenalectomy as last resort
06
Aggressive potassium replacement and spironolactone
07
Antimicrobial prophylaxis (Pneumocystis, antifungals)
08
Multidisciplinary endocrine-oncology follow-up

Which Department to Visit?

You can visit our Endokrinoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.