High precontrast T1 and T2 marrow signal on the sacral and iliac sides of the right SI joint not consistent with acute bone marrow oedema and probably representing the sequelae of previous infection. Low signal sclerosis and possible erosion of the (partially imaged) right SI joint. No evidence on this study that the complex right psoas and iliac is muscle collection has recurred.
Minor L4/L5 disc bulge with minor bilateral lateral recess stenosis without nerve root impingement. L5/S1 disc space height loss and desiccation. Circumferential L5/S1 disc bulge. The focal central-right paracentral disc protrusion at L5/S1 identified on the previous MRI is significantly reduced in size. It contacts but does not impinge the descending S1 nerve roots bilaterally.