[A case of oncocytic adenoma of the pituitary gland with galactorrhea and hyperprolactinemia].

A tumor of hypophysis, with suprasellar expansion, was removed surgically in a 68 years old woman with panhypopituitarism and galactorrhea. Light and electron microscopy studies have shown an oncocytoma. One year after pituitary ablation and cobaltherapy, the patient had normal pituitary functions and galactorrhea had disappeared. Since the prolactin cells were outside the adenoma and the prolactin secretion became normal after surgery, we can assume that galactorrhea was presumably due to the compression of the pituitary stalk by oncocytoma.