Home > Medical Reference > Encyclopedia (English)

Toggle: English / Spanish

 

Ask the Expert

Dr. Schnee’s Bio Image

Get answers to your Neurosurgery questions by
e-mailing Dr. Schnee.

Dr. Schnee’s Bio | Q&A Archive

Note: This is for informational purposes only. Doctors cannot provide a diagnosis via e-mail.

Video details

Do Not Remove This Text

Related Content


 

Prolactinoma - males - All Information

Definition of Prolactinoma - males:

Prolactinomas are benign tumors of the pituitary gland that secrete prolactin. This hormone is best known for inducing milk production in women, but it also serves as a regulator of sexual function in men.

Causes, incidence, and risk factors:

Prolactinomas are the most common pituitary tumors. Men and women are equally likely to be affected. However, smaller tumors (microadenomas) are more common in women, probably because of earlier detection.

Prolactinomas may occur alone or as part of multiple endocrine tumor syndromes.

Symptoms:

Symptoms in men include decreased sex drive, impotence, headache, visual impairment, galactorrhea (secretion of milk, which is uncommon), and symptoms of hypopituitarism (low levels of pituitary function, which result in lowered levels of thyroid or adrenal hormones).

Sexual dysfunction may result from hyperprolactinemia alone or from secondary hypogonadism (low testosterone levels).

Signs and tests:

Signs may include visual field defects, gynecomastia (enlarged breasts), galactorrhea, loss of musculature or body hair, and signs of hypothyroidism or hypoadrenalism.

Tests may show:

  • Elevated prolactin
  • Low testosterone
  • Low FSH and LH
  • MRI or CT scan showing pituitary tumor
  • Abnormal visual fields

Treatment:

Treatment often includes use of dopamine-agonist medications (bromocriptine or cabergoline), which lower levels of prolactin. In severe cases (very large or unresponsive tumors), surgery or radiation may be necessary.

Expectations (prognosis):

Most prolactinomas respond well to medication. However, permanent visual loss or hypopituitarism (lowered function of the pituitary gland) may occur.

Complications:

Complications include visual loss and infertility. Some people experience nasal congestion, dizziness with standing, nausea, and fatigue, which may be side effects of dopamine-agonist medications.

Calling your health care provider:

Call your health care provider if you have any symptoms of prolactinoma.

  • Reviewed last on: 8/6/2004
  • Aniket R. Sidhaye, M.D., Division of Endocrinology and Metabolism, Johns Hopkins University School of Medicine, Baltimore, MD. Review provided by VeriMed Healthcare Network.