[Two cases of distal superior cerebellar artery aneurysm].

Two cases of subarachnoid hemorrhage due to a ruptured aneurysm of the distal superior cerebellar artery (SCA) are reported. In the first case the patient was a 78-year-old woman who complained of severe headaches and was admitted to a local hospital on May 25, 1992. A CT scan revealed a subarachnoid hemorrhage, and an angiogram showed an aneurysm of the right ambient segment of the superior cerebellar artery. Trapping of the aneurysm was successfully performed via a subtemporal approach on June 9, 1992. In the second case the patient was a 46-year-old man who complained of severe headaches and was admitted to Kurume University Hospital. A CT scan showed subarachnoid hemorrhage and an angiogram showed an aneurysm of the right ambient segment of superior cerebellar artery. Trapping of the aneurysm was successfully performed via a subtemporal approach on Sept 11, 1990. Forty-three reported cases of distal SCA aneurysm were reviewed. Only one patient received early surgical treatment, and with surgery in all of the other cases being delayed. Both of our patients underwent delayed surgical treatment with excellent results. The clinical characteristics of distal SCA aneurysms and the timing of surgery are discussed.