Fig. 1

Structural damage lesions. A and B Coronal SPGR FS (Spoiled Gradient-Recalled Echo with Fat Suppression) showing multiple periarticular erosions (white arrows) along both sacroiliac joints. C and D Coronal T1 sequence showing sclerosis (hypointense signal, black arrows) and fatty changes (hyperintense signal, white arrows) over bilateral sacroiliac joints