Ankylosing spondylitis.
D000293:Adolescent; D000328:Adult; D001172:Arthritis, Rheumatoid / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D013167:Spondylitis, Ankylosing / Q000175:diagnosis / Q000628:therapy