[Preoperative scoring and operative complications of unruptured cerebral aneurysms]

Low risk of mortality and morbidity are necessary pre-conditions for surgical treatment of unruptured cerebral aneurysms. We assessed retrospectively 132 patients with angiographically confirmed cerebral aneurysms using an unruptured aneurysm score. Among them, 84 patients were treated surgically. The score consists of the sum of scores for the following factors: associated disease (none: 0, one: 1, two or more: 2); aneurysm size (below 14 mm: 0, 15-24 mm: 1, 25 mm or more: 2); location (anterior circulation: 0, carotid cave: 1, posterior circulation: 2); and multiplicity (single: 0, two or more: 1). Eleven patients had complications and the morbidity rate including asymptomatic lesions was 13.1%. Five patients had permanent neurologic deficits (final morbidity rate 5.9%). The majority of patients with scores less than 1 underwent operations and the morbidity rate was low, whereas patients with scores between 2 and 4 had a higher morbidity rate. Preoperative scoring is useful for predicting surgical risks associated with unruptured cerebral aneurysm.