A prolactinoma is a benign tumor (adenoma) of the pituitary gland that produces a hormone called prolactin. It is the most common type of pituitary tumor. Symptoms of prolactinoma are too much prolactin in the blood (hyperprolactinemia), or those caused by pressure of the tumor on surrounding tissues..
Prolactin stimulates the breast to produce milk, and has many other functions such as regulation of mood. Hence prolactin levels are usually higher during pregnancy and after childbirth. After delivery of a baby, a mother's prolactin levels come down to normal a few weeks after breastfeeding is discontinued. Each time the milk is dispensed, prolactin levels rise; this process may cycle to maintain milk production. In males it is responsible for the sexual refractory period after orgasm and excess levels can lead to erectile dysfunction.
Based on size, a prolactinoma can be classified as a microprolactinoma (<10 mm diameter) or macroprolactinoma (>10 mm diameter).
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http://www.hindawi.com/journals/crinm/2016/8371697/ constantine l. karras, isaac josh abecassis, zachary a. abecassis, et al., “clival ectopic pituitary adenoma mimicking a chordoma: case report and review of the literature,” case reports in neurological medicine, vol. 2016, article id 8371697, 8 pages, 2016. doi:10.1155/2016/8371697
bhat mh, mushtaq s, saba s, saif r, ali g. cabergoline-induced tricuspid regurgitation: case report and review of literature. indian j endocr metab [serial online] 2011 [cited 2016 jul 16];15:137-9. available from: http://www.ijem.in/text.asp?2011/15/2/137/81949
http://www.hindawi.com/journals/crim/2010/573252/ elvis henrique santos andrade, pedro mario pan, paula f. ramalho da silva, and ary gadelha, “new insights in the management of antipsychotics in the treatment of schizophrenia in a patient with prolactinoma: a case report and review of the literature,” case reports in medicine, vol. 2010, article id 573252, 3 pages, 2010. doi:10.1155/2010/573252