Final answer:
A benign pituitary tumor causing prolactin hypersecretion is termed a prolactinoma.
Explanation:
A benign tumor of the pituitary gland that causes the hypersecretion of prolactin is called a prolactinoma. Prolactin, a hormone produced by the anterior pituitary, stimulates milk production and can lead to conditions such as amenorrhea, galactorrhea, and breast enlargement when excessively secreted.
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