Fig. 3

Intraoperative and postoperative images. a The nidus and dilated drainers in the left upper cerebellar hemisphere are shown (arrow). b The distal posterior inferior cerebellar artery aneurysm(DPICAAn) is shown (large arrow). The proximal part of the right PICA is also indicated (small arrow). c The operative view after neck clipping of the DPICAAn (arrow). d The postoperative digital subtraction angiography shows the disappearance of the aneurysm and the cerebellar AVM