Relative calibre of the cervical internal carotid artery. Normal variation with the circle of Willis.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001783:Blood Flow Velocity; D001927:Brain Diseases / Q000175:diagnosis; D002339:Carotid Arteries / Q000000981:diagnostic imaging*; D002533:Cerebral Angiography; D002539:Cerebral Arterial Diseases / Q000000981:diagnostic imaging*; D002648:Child; D002675:Child, Preschool; D002941:Circle of Willis; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D009333:Neck; D009422:Nervous System Diseases / Q000175:diagnosis; D012737:Sex Factors