The MRI findings of dissection include an intramural hematoma, an intimal flap, and the enhancement of the artery wall and septum. MRA can clearly show abrupt luminal stenosis and the disappearance of flow signal at end distal to the dissection. This is 35 year old male with sudden onset posterior circulation infarct seen on DWI and intimal flap in the course images. Note the distal tapering in the basilar artery.
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