Ankylosing spondylitis with childhood onset.
D000293:Adolescent; D000367:Age Factors; D001171:Arthritis, Juvenile / Q000175:diagnosis; D002114:Calcinosis / Q000150:complications; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging; D002648:Child; D003937:Diagnosis, Differential; D006615:Hip / Q000000981:diagnostic imaging; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging; D008297:Male; D011859:Radiography; D012446:Sacroiliac Joint; D012737:Sex Factors; D013167:Spondylitis, Ankylosing / Q000175:diagnosis*; D013997:Time Factors