Occipitalization of the ventral part and vertebralization of the dorsal part of the atlas with insufficiency of the transverse ligament.
D000293:Adolescent; D001368:Axis, Cervical Vertebra / Q000002:abnormalities; D001846:Bone Development; D001270:Cervical Atlas / Q000002:abnormalities* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008022:Ligaments / Q000002:abnormalities* / Q000000981:diagnostic imaging; D009777:Occipital Bone / Q000002:abnormalities* / Q000000981:diagnostic imaging; D011859:Radiography