後交通動脈におけるjunctional dilatationについて

Junctional Dilatation of the Posterior Communicating Artery

Ⅰ．はじめに

後交通動脈が内頸動脈のサイフォン部から分岐する部で，その起始部がわずかに拡大を示す場合があり，これを一般にjunctional dilatation of the Posterior communicating arteryと呼んでいる．なお，別名infundibular widening, infundibulum or infundibular dilata tion of the posterior communicating arteryとも言われている．

我々はTaveras ＆ Wood^13）に従い，junctional dilatation of the Posterior communicating artery　（以下junctional dilatationと略す）と呼んでいる．

Junctional dilatation of the posterior communicating artery was investigated on 1,286 carotid angiograms, which were displayed to 750 patients for recent five years in our department, and the following results were obtained.

1) Incidence;

The junctional dilatation was seen on 96 out of 750 cases (12.8%), whereas on angiograms, this was 105 times out of 1,286 angiograms.

A difference in ratio of appearance between men and women was not statistically significant.

2) Comparison between the left and right side;