中大脳動脈瘤の手術—174例の経験から

Surgical Treatment of the Middle Cerebral Artery Aneurysm:From the Experiences of 174 Cases

Ⅰ．はじめに

　われわれは，1975年9月までの14年間に嚢状脳動脈瘤直接手術1,000症例を経験したが，うち中大脳動脈瘤（以下MCA-AN）は174例であり，これら症例の外科的治療に関し検討を試み，特にこの部動脈瘤手術の要点について報告する．

174 cases of middle cerebral artery aneurysm submitted to surgical operations without using microscope were reviewed.

At operation, the head is set on the neutral and slightly chin up position, not turned to any directions. Small craniotomy, which is about half as much as the ordinary unifrontal craniotomy, is performed. The merit of our method is as follows: the M1 portion (Fisher) of the middle cerebral artery runs horizontally, so that we can keep the parent artery during the operation, and owing to the chin up position the strong retraction of the frontal lobe can be avoided.