斜台部に発生した異所性下垂体腺腫の1例

IR

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  • Ectopic Pituitary Adenoma Occurring in the Clivus

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Ectopic pituitary adenomas are rare and have been described most frequently occurring in the suprasellar region and sphenoid sinus. We present a very rare case of ectopic pituitary adenoma occurring in the clivus. A 54-year-old woman was referred to our hospital complaining of headache. She had no endocrinological abnormalities. Magnetic resonance (MR) imaging showed a clival tumor appearing as isointense on T1-weighted image and slightly hypointense compared with normal brain on T2-weighted image. No connection between the normal pituitary gland was observed. Pre-operative diagnosis was chordoma. By a transsphenoidal approach assisted with neuro-endoscopy, we performed a partial removal of the tumor. No connection between the normal pituitary gland and the tumor was found. Histopathorogical analysis showed a pituitary adenoma. As demonstrated by our case report, differential diagnosis of a clival tumor must include consideration of an ectopic pituitary adenoma.

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