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Endocrine glands
Endocrine glands


Definition:

Acromegaly is a chronic metabolic disorder in which there is too much growth hormone and the body tissues gradually enlarge.



Alternative Names:

Somatotroph adenoma; Growth hormone excess; Pituitary giant; Gigantism



Causes, incidence, and risk factors:

Acromegaly occurs in about 6 of every 100,000 adults. It is caused by abnormal production of growth hormone after the skeleton and other organs finish growing.

Excessive production of growth hormone in children causes gigantism rather than acromegaly.

The cause of the increased growth hormone release is usually a noncancerous (benign) tumor of the pituitary gland. The pituitary gland, which is located just below the brain, controls the production and release of several different hormones, including growth hormone.



Symptoms:
  • Body odor
  • Carpal tunnel syndrome
  • Decreased muscle strength (weakness )
  • Easy fatigue
  • Enlarged bones of the face
  • Enlarged feet
  • Enlarged hands
  • Enlarged glands in the skin (sebaceous glands)
  • Enlarged jaw (prognathism) and tongue
  • Excessive height (when excess growth hormone production begins in childhood)
  • Excessive sweating
  • Headache
  • Hoarseness
  • Joint pain
  • Limited joint movement
  • Sleep apnea
  • Swelling of the bony areas around a joint
  • Thickening of the skin, skin tags
  • Widely spaced teeth
  • Widened fingers or toes due to skin overgrowth with swelling, redness, and pain

Other symptoms that may occur with this disease:

  • Excess hair growth in females
  • Weight gain (unintentional)


Signs and tests:

This disease may also change the results of the following tests:



Treatment:

Surgery to remove the pituitary tumor causing this condition corrects the abnormal growth hormone secretion in most patients. This surgery may not be available to patients in remote locations, so travel to a larger metropolitan area may be necessary for treatment.

Radiation of the pituitary gland is used for people who do not respond to the surgical treatment. However, the reduction in growth hormone levels after radiation is very slow.

The following medications may be used to treat acromegaly:

  • Octreotide (Sandostatin) or bromocriptine (Parlodel) may control growth hormone release in some people.
  • Pegvisomant (Somavert) directly blocks the effects of growth hormone, and has been shown to improve symptoms of acromegaly.

These medications may be used before surgery, or when surgery is not possible.

After treatment, periodic evaluation is necessary to ensure that the pituitary gland is working normally. Yearly evaluations are recommended.



Support Groups:



Expectations (prognosis):

Pituitary surgery is successful in most patients, depending on the size of the tumor and the experience of the surgeon.

Without treatment the symptoms will get worse, and the risk of cardiovascular disease increases.



Calling your health care provider:

Call your health care provider if you have symptoms of acromegaly, or if your symptoms do not improve with treatment.



Prevention:

There are no methods to prevent the condition, but early treatment may prevent complications of the disease from getting worse.



References:

Melmed S, Kleinberg D. Anterior pituitary. In: Kronenberg HM, Melmed S, Polonsky KS, Larsen PR, eds. Williams Textbook of Endocrinology. 11th ed. Philadelphia, PA: Saunders Elsevier; 2008:chap 8.




Review Date: 3/18/2008
Reviewed By: Elizabeth H. Holt, MD, PhD, Assistant Professor of Medicine, Section of Endocrinology and Metabolism, Yale University. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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789 Central Avenue, Dover, NH 03820
Phone: (603) 742-5252
Toll free: 1 (877) 201-7100