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In a patient with thromboembolic infarction within right cerebellum (A), CTA (B, C, D) shows normal caliber of left VA at the proximal part of the V3 and V4 but narrowed at the distal part of the V3 (short arrow showing distal V3 on C) (long arrows showing proximal V3 and V4 on D). Distal V3 narrowing (C) is associated with intramural hematoma (crescent sign) on fat sat T1W images (E). Findings are suggestive of distal V3 dissection.
