Anomalous atlanto-occipital fusion.
D000293:Adolescent; D000328:Adult; D001269:Atlanto-Occipital Joint / Q000002:abnormalities*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D012575:Schools, Dental; D012886:Skull / Q000002:abnormalities / Q000033:anatomy & histology*; D013781:Texas