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1 From the Department of Neurology, Louisiana State University School of Medicine, New Orleans, Louisiana
A case is reported with a single large external carotid-vertebral anastomosis which was demonstrated by carotid angiography.
The various reasons for development of such a channel are discussed.
The presence of a large single channel, the direct course and lack of branching, and the lack of previous neurologic symptoms indicate that this particular vessel represents a congenital maldevelopment of the vascular supply to the brain.
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