title: Ankylosing spondylitis.
mesh_terms: D000372:Agglutination Tests; D001172:Arthritis, Rheumatoid / Q000175:diagnosis; D001269:Atlanto-Occipital Joint; D002114:Calcinosis / Q000150:complications; D003937:Diagnosis, Differential; D004912:Erythrocytes; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000150:complications; D008297:Male; D009999:Ossification, Heterotopic; D011859:Radiography; D012446:Sacroiliac Joint / Q000000981:diagnostic imaging / Q000473:pathology; D012737:Sex Factors; D013167:Spondylitis, Ankylosing / Q000097:blood / Q000000981:diagnostic imaging / Q000473:pathology