The combination of occipitalization of the atlas with atlanto-axial dislocation due to an extravertebral (inflammatory) process in the head-neck region.
D001269:Atlanto-Occipital Joint / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D001368:Axis, Cervical Vertebra / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D002675:Child, Preschool; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D008199:Lymphadenitis / Q000150:complications; D008297:Male; D011859:Radiography