Fig. 1

Imaging findings. a Computed tomography (CT) scan of the brain revealing subarachnoid hemorrhage. b CT angiographic view showing an aneurysm of the posterior communicating artery branching from the left internal carotid artery (arrow). c Intraoperative view showing a ruptured aneurysm* with bleb. d Postoperative axial CT imaging showing Sugita clip and no additional bleeding. e and f A diffusion-weighed magnetic resonance (MR) imaging and MR angiographical scan showing the absence of cerebral infarction or cerebral vasospasm. *An, aneurysm; ICA, internal carotid artery; MCA, middle cerebral artery; Pcom, posterior communicating artery