Os odontoideum. A radiologic indicator for a disease with many facets.
D000328:Adult; D001368:Axis, Cervical Vertebra / Q000002:abnormalities* / Q000000981:diagnostic imaging; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D011859:Radiography; D013122:Spinal Diseases / Q000151:congenital / Q000000981:diagnostic imaging