[Aneurysms of the anterior communicating artery and anomalies of the anterior part of the circle of Willis].

Aneurysms of the anterior communicating artery are much more frequently encountered in subjects with developmental anomalies of the anterior part of the Willis circle than in the general population. The most frequent anomaly is hypoplasia of the A1 ACa segment, duplication of the anterior communicating artery or accessory artery of the corpus callosum. In the material of the authors of 130 surgically treated cases of the aneurysm situated in the anterior communicating artery complex developmental anomalies were found in 37.7%.