Fig. 2From: Diagnositic value of pelvic enthesitis on MRI of the sacroiliac joints in enthesitis related arthritisEnthesitis of the retroarticular interosseous ligaments in a 12-year-old boy with enthesitis-related arthritis. a-c. Consecutive semicoronal STIR MR images demonstrate enthesitis of the retroarticular interosseous ligaments on the right side (arrows). d-f. Corresponding semicoronal T1-weighted images demonstrate that the high signal is seen in the retroarticular fat tissue and not in the cartilaginous part of the SI jointBack to article page