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Ⅰ.はじめに
異所性下垂体腺腫は比較的稀であり,鞍上部と蝶形骨洞内に好発する7,17).前者の起源は下垂体隆起部と考えられるが5),この部位で非機能性であった報告は極めて少ない7,17).今回われわれは,鞍上部に発生した非機能性下垂体腺腫を経験したので,文献的考察を加えて報告する.
A case of nonfunctioning suprasellar ectopic pituitary adenoma in a 49-year-old man is reported. The patient was refered to us with a partial visual field defect of the right eye. Neuroendocrinological examinations showed slightly higher levels of adrenocorticotrophic hormone and prolactin. MR imagings revealed an enhancing suprasellar tumor and a normal pituitary gland in the sella turcica. The patient underwent a craniotomy and the tumor was partially removed, although it was firmly attached to the pituitary stalk. The tumor was diagnosed histologically as a nonfunctioning pituitary adenoma. Cases of nonfunctioning suprasellar ectopic pituitary adenoma have rarely been reported. The pathophysiology of such tumors is discussed.
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