Hypoplastic distal part of the basilar artery.
D000328:Adult; D001488:Basilar Artery / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000196:embryology; D002533:Cerebral Angiography; D002536:Cerebral Arteries / Q000196:embryology; D002560:Cerebrovascular Circulation; D002941:Circle of Willis / Q000033:anatomy & histology; D003388:Cranial Fossa, Posterior / Q000098:blood supply; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged