A 38-year-old woman presented with impaired consciousness and anisocoria due to a subarachnoid hemorrhage and an intracerebral hemorrhage of the left temporal lobe. Examination revealed severe tortuosity in the left middle cerebral artery and three sequential bead-like aneurysms. She underwent a craniotomy in the acute phase to stop rebleeding at the rupture site and remove the intracerebral hematoma. During the chronic phase, endovascular treatment with superselective balloon test occlusion (ssBTO) was performed for the remaining aneurysms. Preoperative ssBTO was useful in evaluating collateral circulation and assessing the curability of the treatment.