(A, B) Diffusion-weighted sequence of MRI of the brain shows acute infarction in the right MCA territory. (C, D) Catheter angiography showed irregularities of the right supraclinoid internal carotid artery, extending into the M1 segment of the right MCA. An intimal flap (arrow) indicates dissection.
MRI: magnetic resonance imaging; MCA: middle cerebral artery.