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Ankylosis of the sacroiliac joints. Coronal oblique MR images acquired in a 53-year-old man with SpA show bony fusion of the sacroiliac joints as (a) high signal intensity on T1-weighted imaging (fatty degeneration) and (b) low signal intensity on STIR imaging. A sclerotic remnant of the sacroiliac joints is highlighted (arrows). c Radiography of the sacroiliac joints confirms these structural bony changes
