[Aneurysms of the pericallosal region].

Aneurysms of the peripheral parts of the anterior cerebral artery account for from 2.0% to 4.5% of all intracranial aneurysms. Frequent diagnostic difficulties caused by small size of the aneurysm and scant reports in the literature induced the authors to describe 12 cases of pericallosal artery aneurysms. They accounted for 4.1% of all aneurysms treated surgically in the years 1977-1984. Good results were achieved in 66.6% of cases and were related mainly to the initial state of the patient. Postoperative mortality was 16.8% and was related mainly to severe initial state, number of subarachnoid haemorrhages in the history, and vasospasm. The authors consider that the operative risk in pericallosal artery aneurysms is not higher than in aneurysms of other location.