原発性クモ膜嚢腫の成人例

Primary Arachnoid Cyst in an Adult

Ⅰ．はじめに

　クモ膜嚢腫の多くは，腫瘍あるいは炎症等に伴う，いわゆる続発性あるいは二次性クモ膜嚢腫といわれるものであり，嚢腫の成因不明な原発性，あるいは一次性クモ膜嚢腫といわれるものは比較的稀な様である，又，原発性嚢腫の多くは若年層に発症するとされて居り，成入に発症する症例となると更に少ない様であるが，我々は原発性クモ膜嚢腫と考えられる42歳の女性症例を経験したので，その症例及び若干の文献的考察を併せ報告する．

Primary arachnoid cyst in adults seems to be relatively rare.

Our case was a 42-year-old female, who complained of diplopia, dizziness, mild headache, and showed papilledema. Right carotid angiograms revealed the characteristic findings.

Right fronto-parietal craniotomy was then performed. In the operation, a large, thin walled cyst was found on the surface of the right cerebral hemisphere. When the membrane was removed, essentially normal, but slightly atrophi gyri, could he seen. Aspiration of encapsulated fluid, and extirpation of the cyst wall resulted in an excellent improvement.