颅内动脉瘤(intracranial aneurysms,AN)是由于局部血管异常改变而产生的脑血管瘤样突起。发病率居于脑血管意外病人中的第三位,仅次于脑血栓形成和高血压脑出血,但其病死率、致残率极高,总病死率约为40%~50%。随着现代医学影像技术的发展,电子计算机断层扫描(CT)、磁共振扫描( Intracranial aneurysms (AN) are cerebrovascular hemangioid processes that arise as a result of local vascular abnormalities. The incidence of living in cerebrovascular accident patients in third place, second only to cerebral thrombosis and hypertensive intracerebral hemorrhage, but its mortality, high morbidity, the total case fatality rate of about 40% to 50%. With the development of modern medical imaging technology, computerized tomography (CT), magnetic resonance imaging (MRI