Fig. 2

a A temporary block of the proximal and distal M1 segment of the middle cerebral artery, and a clip of the aneurysm neck with a 6.5 mm curved aneurysm clip. b Microscopic inspection revealed a golden-colored metallic foreign body approximately 1 cm in length, situated within the M1 segment of the right middle cerebral artery. c The foreign body is about 1 cm and covered with rust. d, e Postoperative computed tomography angiography (CTA) showed that the foreign body was removed. f Intracranial CT scan 10 days after surgery showed significant absorption of subarachnoid hemorrhage. The white arrows in a and b indicate the location of the foreign object under the microscope