title: Os odontoideum in chondrodystrophia calcificans congenita. A case report.
mesh_terms: D001174:Arthrodesis; D001268:Atlanto-Axial Joint / Q000000981:diagnostic imaging / Q000601:surgery; D002648:Child; D002806:Chondrodysplasia Punctata / Q000150:complications*; D006801:Humans; D007593:Joint Instability / Q000209:etiology* / Q000601:surgery; D008297:Male; D011859:Radiography