Congenital absence of the odontoid process.
D001368:Axis, Cervical Vertebra / Q000002:abnormalities*; D001921:Brain / Q000002:abnormalities*; D001927:Brain Diseases; D001270:Cervical Atlas / Q000002:abnormalities*; D004827:Epilepsy; D006801:Humans; D009809:Odontoid Process
ATLAS AND AXIS/abnormalities; BRAIN/abnormalities; EPILEPSY