A unique anomaly of the intracranial arteries of man.
D000368:Aged; D002339:Carotid Arteries / Q000002:abnormalities* / Q000196:embryology; D002536:Cerebral Arteries / Q000002:abnormalities*; D002941:Circle of Willis / Q000002:abnormalities / Q000196:embryology; D006801:Humans; D008297:Male