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Seronegative spondyloarthropathies. (A) Squaring and shiny corner sign in ankylosing spondylitis; (B) bamboo spine; (C) the dagger sign in ankylosing spondylitis; (D) coarse bone bridges in psoriatic spondyloarthropathy. There is also ossification of the iliolumbar ligaments (lower arrows); (E) bone bridges in psoriatic arthritis before (E) and after bone fractures (F). Arrows point the main abnormality in each case.
