prolactinoma

prolactinoma A benign tumor (called an adenoma) of the pituitary gland. Prolactinomas produce an excessive amount of the hormone prolactin. Prolactinomas are the most common type of pituitary tumor. Symptoms of prolactinoma are caused by pressure of the tumor on surrounding tissues or by excessive prolactin in the blood (hyperprolactinemia). Treatment may involve medications and/or surgery. See also prolactin.