シルビウス裂くも膜嚢胞の対側に生じた慢性硬膜下血腫の１例

抄録

An arachnoid cyst is sometimes found in chronic subdural hematoma patients, and the two lesions usually reside ipsilaterally. However, although it is rare, there are cases where the lesions occur contralaterally. Here we report a case of a chronic subdural hematoma that occurred at the contralateral side of a middle fossa large arachnoid cyst. Although the hema­toma was successfully surgically evacuated by drainage, a space–occupying hematoma formed within the arachnoid cyst post–surgery. No surgical intervention was required, but it took seven months for the hematoma to resolve. This case highlights a possibility that achieving complete hemostasis of chronic subdural hematoma could be more difficult in cases complicated by a large arachnoid cyst than typical cases.