[Angiographic analysis of the anterior cerebral arteries with cerebral aneurysms--with special interest in the morphological aspect including so-called vascular anomalies].

In a series of 704 aneurysm patients who were admitted to the Research Institute for Brain and Blood Vessels-AKITA for the last 9.5 years (from October, 1974 to March, 1983), angiographic features of the anterior cerebral arteries and related vascular anomalies were analyzed with reference to the site of aneurysms. The age distribution was from 20 to 78 years (mean age 53 years), and the men to women ratio was 1:1.1. The total number of aneurysms was 866. The site distribution of aneurysms consisted of 230 (27%) anterior communicating, 269 (31%) middle cerebral, 282 (38%) internal carotid, 54 (6%) anterior cerebral, 45 (5%) vertebrobasilar and 6 other arteries. More than one aneurysm were found out in 137 cases. The total number of performed cerebral angiograms was 1840, in these right carotid arterial angiograms were 652, left carotid 644 and vertebral 544. Cases were divided into two groups, namely one who had the anterior communicating artery (Acom) aneurysm and the other who had not. Angiographic calibers of A1 portion (proximal portion of the anterior cerebral artery) were compared statistically between these two groups. As a result, three points as below were clarified in this series. 1) The Acom aneurysm group showed the significant asymmetry of A1 (p less than 0.005) compared to the other cases. 2) The left A1 portions were significantly dominant (p less than 0.05) to the right in the Acom aneurysm group. 3) Angiographic hypoplasias and aplasias of A1 were found in the Acom aneurysm group more frequently than in the other with statistical significance (p less than 0.005).(ABSTRACT TRUNCATED AT 250 WORDS)