Recurrent vertebrobasilar embolism out of a blind sack

Stump embolism as a cause of vertebrobasilar stroke
Digital subtraction angiography shows an ascending cervical artery with collateral refilling of the distal vertebral artery (VA). The arrow indicates the blind sack of the proximally occluded VA with a resident embolus, the presumed source of the recurrent ischemia.

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