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Sacroiliitis in a 17-year-old boy. (a) Semicoronal STIR MR image shows erosions on both SI joints (arrows) with extensive surrounding BME at the sacral side of the left SI joint (short arrows). (b) Semicoronal T1-weighted MR image shows erosions on both SI joints and subchondral sclerosis at the iliac side of the right SI joint.
