For a complex intracranial aneurysm originating from the A2 and beyond, in situ side-to-side bypass may be sufficient for cerebral revascularization with aneurysm trapping. Reanastomosis and reimplantation may also be considered alternative treatment modalities. However, in some specific cases with contradictions to all abovementioned bypass techniques, bypass with interposition grafts may be the last resort for treatment. A short radial artery (RA) was usually harvested as the interpositional graft.