内頸動脈後交通動脈分岐部動脈瘤の2型分類とその手術アプローチ

Abstract

The internal carotid-posterior communicating artery aneurysm is common, and a lot of brief reports have been presented about the classification and surgical approach for this aneurysm. The authors noticed the presence of small redish bulges in this portion, of the artery, which are thought to be the origin of aneurysms. Most of them were observed on the lateral wall of origin of the posterior communicating artery, and others were located on the inferior wall of the internal carotid artery including the infundibular widening of the posterior communicating artery. In this report, judging from these findings, the aneurysms were classified into two types: posterior communicating artery origin type and internal carotid artery origin type. The morphologic charactaristics and basic surgical procedures of these aneurysms were presented in two types respectively.In some subjects, this classification has similarities to former classificstions, but this one is based on a new concept, as mentioned above. Aneurysm surgery based on the concept of this classification shoud be safer and easier to perform.