Anatomical variations of the arterial system of the base of the brain.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002536:Cerebral Arteries / Q000033:anatomy & histology*; D002648:Child; D002675:Child, Preschool; D002941:Circle of Willis / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged