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FIG 3. Images obtained in a 51-year-old man with a sudden onset of vertigo, nausea, vomiting, and subsequent loss of consciousness. a, Conventional angiogram of the right VA shows a smoothly tapered occlusion of the VA starting from the proximal V3 segment (arrows). b and c, MIP CT angiograms show the dissection is actually starting from the junction of V3 and V4 (black arrow) with an abrupt occlusion. The faint shadow of intramural hematoma is noted at the junction of V4 and V3-V4 junction (white arrows).
