Postoperative magnetic resonance angiography (MRA) findings. MRA shows high-flow radial artery bypass between the M2 segment of the left middle cerebral artery (MCA) and the left cervical external carotid artery, with an additional superficial temporal artery (STA)–MCA bypass. Peripheral cerebral blood flow is maintained by the bypasses. The left internal carotid artery is trapped, and no blood flow is observed. Arrowheads indicate the high-flow bypass, and arrows indicate the STA–MCA bypass.