Intrasellar arachnoid cystの1例

A Case of Intrasellar Arachnoid Cyst

I．はじめに

　トルコ鞍部には下垂体腺腫をはじめとして，頭蓋咽頭腫^3），empty sella^19），Rathke’s cleft cyst^5,15,21），類上皮腫^16,26）（類皮腫）などのさまざまなspace occupyinglesionが発生する．これらの病変のうちには，のう胞を形成するものが少なくない．intrasellar arachnoid cyst（ISAC）は稀であるが，上記病変との鑑別を要する疾患である．われわれは視力障害を主訴として来院し，経蝶形骨洞手術により治癒させることのできたISACの1例を経験したので報告する．

Intrasellar arachnoid cyst is very rare. We report acase of intrasellar arachnoid cyst and review 15 caseswhich were previously reported.

A 58-year-old male was admitted for evaluation ofvisual disturbance on April 24, 1981. Neurologicalexamination revealed bilateral decreaced visual acuity,optic atrophy and bitemporal hemianopsia. X-rayfilm of the skull showed a balloon-shaped sella turcicawith thinning of the cortex of the sella floor. Axialand coronal CT scan showed a cystic lesion withwater-density occupying the intrasellar and suprasellarregion. After administration of contrast medium,no enhancement was noted.