title: Superior marginal rib defects in ankylosing spondylitis.
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012272:Ribs / Q000000981:diagnostic imaging / Q000473:pathology*; D013167:Spondylitis, Ankylosing / Q000000981:diagnostic imaging* / Q000473:pathology