title: Congenital os odontoideum with Klippel-Feil anomaly and fatal atlanto-axial instability. Report of a case.
mesh_terms: D000368:Aged; D001368:Axis, Cervical Vertebra / Q000002:abnormalities*; D001270:Cervical Atlas / Q000002:abnormalities*; D006801:Humans; D007714:Klippel-Feil Syndrome / Q000150:complications* / Q000473:pathology; D008297:Male; D013122:Spinal Diseases / Q000150:complications*; D013580:Synostosis / Q000150:complications*