This study describes the SIJ differences in axSpA vs. non-axSpA pts with CBP axSpA: BME w/ widespread distribution & inflamm⬇️ over time non-axSpA: BME rare or limited only to ventral & middle superior sacrum Findings may improve MRI ID of axSpa AbsPOS0193 @RheumNow #EULAR2026 https://t.co/7eiHQOOIWs