Axial involvement in PsA (axPsA)? study of 581 PsA pts (mean 45 yrs) found 31% w/ SpA-SI joint (SIJ) abnormalities on MRI (MRI-axPsA). MRI-axPsA pts had BM edema(69%), erosions (68%), fat lesions (58%). ~45% w/ Xrays, 29% met Xray mNY criteria for AS (38% +MRI). +MRI assoc w/ https://t.co/MRbs8G3MWq