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Fig. 1D —28-year-old man with ankylosing spondylitis for 10 years. Laboratory results and clinical findings were as follows: C-reactive protein, 7.3 mg/L; erythrocyte sedimentation rate, 5 mm/h; Bath Ankylosing Spondylitis Functional Index (BASFI), 80.0; Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), 60.2; inflammatory back pain score, 94; nocturnal back pain score, 83; total back pain score, 82. Coronal STIR image shows focal T2 prolongation at inferior sacroiliac joint (arrows).