Objective.To summarize the experience of minim ally invasive treatment in 520patie nts with intracranial aneurysms on a retrospective study.Methods.The measures used in the treatment of520patients were reviewed in terms o f timing of surgery

induced-hypotensive anesthesia

b rain protection combined with temporal occlusion of the feeding artery

exter-nal drainage of CSF

dynamic monitoring of intracranial pressure

blood flow velocity

serum osmolality and CT scanning

anti-vasospasm therapy a s well as selected interventional en dovascular embolization of aneurysms.Results.Of the 520patients

485were treated with either direct clipping or endov ascular embolization and35patients were treated non-surgic ally.In 449patients undergoing dir ect clipping and 36undergoing endov ascu-lar embolization

intraoperative r upture of aneurysm occurred in 27（6.0%）and 0%

respectively.Death oc-curred in 13（2.6%）

hemiplegia in 8（1.6%）

and vegetative state in 2（0.4%）.The operative mortality of direct clipping was 3.8%in 210patie nts before 1990and 1.8%in 275patien ts after 1990（36patients undergo-ing endovascular embolization

the operative mortality was 0%）.Conclusion.The outcome of patients with intracranial aneurysms can be markedly impr oved and the opera-tive mortality can be lowered by mini mally invasive treatment.