CHARACTERISTICS OF INTRACRANIAL ANEURYSMS ASSOCIATED WITH MOYAMOYA DISEASE - A REVIEW OF 111 CASES

A retrospective analysis of 111 patients with aneurysms associated wit h Moyamoya disease is presented. The subjects comprised of our 12 case s and 99 other well-documented cases. These 111 cases had 131 aneurysm s. There were 48 males and 63 females. The average age was 40.3 years. The clinical manifestations were intracranial haemorrhage in 99 cases (89%), and ischaemic events in 9 cases (8%), but no mention was made of these in the last three cases (2%). The Hunt and Kosnik grades were grade 1 in 8%, grade 2 in 23%, grade 3 in 31%; grade 4 in 35%, and gr ade 5 in 3%. Of the 131 aneurysms, 73 (56%) were found distributed aro und the circle of Willis, 24 (18%) in the basal ganglia, 29 (22%) on c ollateral vessels, and 5 (4%) on other vessels. Forty-six percent of t he cases were treated surgically, 51% conservatively, and 3% by endova scular procedures. The surgical procedures for the aneurysms were; nec k clipping in 49%, aneurysmectomy in 18%, wrapping of the aneurysm in 11%, coating or cautery of the aneurysm in 7%, and revascularization o nly in 11%. The outcomes were Glasgow Outcome Scale 1 in 30%, 2 in 22% , 3 in 11%, 4 in 1%, and 5 in 25%. The main reasons for the unfavourab le outcome were initial poor clinical grade and rebleeding. Follow-up angiography of 25 aneurysms demonstrated that all aneurysms in the bas al ganglia or on the collateral vessels disappeared. We recommend surg ical intervention for aneurysms associated with Moyamoya disease to pr event rupture or rebleeding, especially for aneurysms around the circl e of Willis. However, direct surgery is not recommended for aneurysms found in the basal ganglia or on the collateral vessels.