Proatlantal intersegmental artery.
D000328:Adult; D001165:Arteriovenous Malformations / Q000000981:diagnostic imaging*; D001488:Basilar Artery / Q000002:abnormalities*; D002343:Carotid Artery, Internal / Q000002:abnormalities*; D002533:Cerebral Angiography; D006801:Humans; D008297:Male; D014653:Vascular Headaches / Q000209:etiology