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Ectopic Cushing syndrome
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Ectopic Cushing syndrome

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Cushing syndrome – ectopic; Ectopic ACTH syndrome

Ectopic Cushing syndrome is a form of Cushing syndrome in which a tumor outside the pituitary or adrenal glands produces a hormone called adrenocorticotropic hormone (ACTH).

Other forms of Cushing syndrome include:

  • Cushing disease
  • Cushing syndrome caused by adrenal tumor
  • Exogenous Cushing syndrome

I Would Like to Learn About:

  • Causes

    Cushing syndrome is a disorder that occurs when your body has a higher than normal level of the hormone cortisol. This hormone is made in the adrenal glands. Too much cortisol can be due to various problems. One such problem is called Cushing disease. It occurs when the pituitary gland makes too much of the hormone ACTH. ACTH then signals the adrenal glands to produce too much cortisol.

    Ectopic Cushing syndrome, on the other hand, occurs when ACTH is produced somewhere other than the pituitary gland. Ectopic means occurring in an abnormal place.

    Ectopic Cushing syndrome is caused by tumors that release ACTH. Tumors that can, in rare cases, release ACTH include:

    • Benign carcinoid tumors of the lung
    • Islet cell tumors of the pancreas
    • Medullary carcinoma of the thyroid
    • Small cell tumors of the lung
    • Tumors of the thymus gland
  • Symptoms

    Ectopic Cushing syndrome tends to have fewer symptoms than classic Cushing syndrome. Most people with Cushing syndrome have:

    • Round, red, and full face (moon face)
    • Slow growth rate in children
    • Weight gain with fat accumulation on the trunk, but fat loss from the arms, legs, and buttocks (central obesity)

    Skin changes that are often seen:

    • Skin infections
    • Purple marks (1/2 inch or more wide) called striae on the skin of the abdomen, thighs, and breasts
    • Thin skin with easy bruising

    Muscle and bone changes include:

    • Backache, which occurs with routine activities
    • Bone pain or tenderness
    • Collection of fat between the shoulders and above the collar bone
    • Rib and spine fractures caused by thinning of the bones
    • Weak muscles, especially of the hips and shoulders

    Women may have:

    • Excess hair growth on the face, neck, chest, abdomen, and thighs
    • Periods that become irregular or stop

    Men may have:

    • Decreased or no desire for sex
    • Impotence

    Other symptoms that may occur include:

    • Mental changes, such as depression, anxiety, or changes in behavior
    • Fatigue
    • Headache
    • Increased thirst and urination
  • Exams and Tests

    The health care provider will perform a physical exam and ask about your symptoms.

    Tests that may be done include:

    • 24-hour urine sample to measure cortisol and creatinine levels
    • Blood tests to check ACTH, cortisol, and potassium levels
    • Dexamethasone suppression test
    • Fasting glucose
    • MRI and high resolution CT scans to find the tumor
  • Treatment

    The best treatment for ectopic Cushing syndrome is surgery to remove the tumor. Surgery is usually possible when the tumor is noncancerous (benign).

    In some cases, the tumor is cancerous and spreads to other areas of the body before the doctor can discover the problem with cortisol production. Surgery may not be possible in these cases. But the doctor may prescribe medicines to block cortisol production.

  • Outlook (Prognosis)

    Surgery to remove the tumor may lead to full recovery. But there is a chance that the tumor will come back.

  • Possible Complications

    The tumor may spread or return after surgery. A high cortisol level may continue.

  • When to Contact a Medical Professional

    Call your health care provider if you develop symptoms of Cushing syndrome.

  • Prevention

    Prompt treatment of tumors may reduce the risk in some cases. Many cases are not preventable.

Related Information

  ACTH blood testTumorAdrenal glandsCushing syndrome...Rheumatoid arthrit...AsthmaPancreatic islet c...Medullary carcinom...Pheochromocytoma...     Rheumatoid arthrit...Asthma in adults...

References

McGee S. Cushing syndrome. In: Evidence-Based Physical Diagnosis. 3rd ed. Philadelphia, Pa: Elsevier Saunders. 2012:chap 13.

Stewart PM, Krone NP. The adrenal cortex. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, eds. Williams Textbook of Endocrinology. 12th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 15.

Susmeeta TS, Nieman LK. Cushing's syndrome: all variants, detection, and treatment. Endocrinol Metab Clin N Am. 2011;40:379-391.

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Review Date: 11/7/2013  

Reviewed By: Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

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