初老期に発症した大脳半球間裂くも膜嚢胞の1例

A Case of Symptomatic Interhemispheric Arachnoid Cyst in the Elderly

I．はじめに

　くも膜嚢胞は中頭蓋窩や後頭蓋窩に多いが，大脳半球間裂に生じることはまれである^4,7）．われわれは初老期に症状を発症した大脳半球間裂くも膜嚢胞を経験したので文献的考察を加えて報告する．

The incidence of interhemispheric cyst is rare. There have been only 12 cases reported in adults sincethe advent of CT. We encountered a case of an interhemispheric arachnoid cyst in a 54-year-old patientwho had developed paraparesis. Excision of the cystic wall produced a satisfactory result. The CT and MRI scans were not contributory to histological differentiation of the lesions. According to the literature,however, it is highly likely that these patients are suffering from an arachnoid cyst, when the interhemi-spheric cyst without agenesis of the corpus callosum occurs in adults.