Preliminary definition of a +MRI for struc lesions in the SIJs in axSpA: Erosion in ≥2 consec slices or in ≥3 SIJ quad and fat lesion w depth >1cm in ≥1 SIJ quad are high priority for def an MRI struc lesion of axSpA. Abs OP0079 #EULAR2020 @RheumNow https://t.co/9RlSOUviJQ https://t.co/l4XiQDj8e4