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Sacroiliitis in four patients. (A) Axial STIR in active inflammatory spondyloarthropathy. (B) CT showing structural changes at the sacroiliac joints. (C) T2 weighted image of a patient with chronic sacroiliitis with fused joints. (D) Axial STIR sequence image of a patient with post-partum subchondral edema at both iliac wings. STIR, short tau inversion recovery; CT, computed tomography.
