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Division of inflammatory changes in the sacroiliac joints in MRI according to the ASAS.
| Active inflammatory changes | Chronic inflammatory changes |
|---|---|
| Bone marrow oedema/osteitis | Subchondral sclerosis |
| Capsulitis | Erosions |
| Synovitis | Fatty transformation of the bone marrow |
| Enthesitis | Bony bridges/ankylosis |
