血管开窗畸形 ,也即血管局部节段性扩张 ,是一种罕见的先天性动脉变异。据一组尸体解剖的文献报道基底动脉的开窗畸形发生率为 1.3 %～ 5 .3 % [1] ;基底动脉开窗畸形的血管造影发生率为 0 .4%～ 0 .6% [2 ] 。基底动脉开窗畸形并发颅内动脉瘤非常罕见 ,首例报道是 1979年[3 ] Vascular fenestration, also known as segmental vascular dilatation, is a rare congenital arterial variation. According to a group of autopsy reports of the incidence of basilar artery window abnormalities was 1.3% ~ 5.3% [1]; basilar artery fenestration angiography incidence was 0.4% -0.6% [2 ]. Basilar artery window abnormalities complicated by intracranial aneurysms is very rare, the first case was reported in 1979 [3]