Atlanto-axial dislocation due to agenesis of the os odontoideum or odontoid.
D000293:Adolescent; D000328:Adult; D001368:Axis, Cervical Vertebra / Q000601:surgery; D001270:Cervical Atlas / Q000601:surgery; D000013:Congenital Abnormalities / Q000150:complications; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000209:etiology* / Q000601:surgery; D008297:Male; D008722:Methods; D008875:Middle Aged; D013131:Spine / Q000002:abnormalities*; D014143:Traction