The "os odontoideum", report of a case.
D000293:Adolescent; D001368:Axis, Cervical Vertebra / Q000293:injuries; D001270:Cervical Atlas / Q000293:injuries; D002574:Cervical Vertebrae / Q000002:abnormalities* / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging; D008297:Male; D011859:Radiography