Fig 1. Patient 11, a 43-year-old woman with an incidentally discovered fusiform P2 aneurysm.

A, Lateral projection of vertebral aneurysm shows an 8-mm fusiform P2 aneurysm.

B, Simultaneous angiogram of vertebral artery and right internal carotid artery shows complete occlusion of the aneurysm including the parent PCA and good filling of distal PCA branches through leptomeningeal collateral vessels.

C, MR imaging 6 weeks after PCA occlusion shows no infarction in PCA territory.