The most common type of pituitary tumor, which causes the pituitary to oversecrete prolactin, is

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A prolactinoma is a type of pituitary tumor that causes excessive production of prolactin, a hormone responsible for milk production in women. It is the most common type of pituitary tumor, comprising about 40% of all pituitary tumors. Thymomas are tumors of the thymus gland, islet cell carcinoma is a type of pancreatic cancer, and pheochromocytoma is a tumor of the adrenal gland, none of which are related to pituitary hormone secretion.

The Most Common Type of Pituitary Tumor, Which Causes the Pituitary