Follow-up findings in three patients with spinal ankylosing spondylitis.
D000328:Adult; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D011859:Radiography; D013131:Spine / Q000000981:diagnostic imaging; D013167:Spondylitis, Ankylosing / Q000000981:diagnostic imaging / Q000503:physiopathology*