Prolactinoma

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Endocrine glands

A prolactinoma is a non-cancerous pituitary tumor that produces a hormone called prolactin. This results in too much prolactin in the blood.

Prolactinoma - females; Adenoma - secreting; Prolactin-secreting ademoma of the pituitary

Prolactin is a hormone that triggers lactation or milk production. It also plays a role in sexual desire.

Prolactinoma is the most common type of pituitary adenoma, making up for at least 30% of all pituitary adenomas. Prolactinomas occur most commonly in people under age 40. They are about fives times more common in women than men, but are rare in children.

The size of a prolactinoma is equal to the prolactin level. In other words, the larger the tumor, the higher the level of prolactin produced the pituitary gland.

At least half of all prolactinomas are very small (less than 1 cm or 3/8ths of an inch in diameter). These micro-prolactinomas are more common in women. Larger tumors, called macro-prolactinomas, are more common in men.

Many small tumors remain small and never get larger. Prolactinomas in men tend to occur at an older age and can grow to a large size before any symptoms appear.

Review Date: 10/25/2006
Reviewed By: Robert Hurd, M.D., Department of Biology, College of Arts and Sciences, Xavier University, Cincinnati, OH. Review provided by VeriMed Healthcare Network.