Minimal generalized reduction in T1 signal in the L4 vertebral body with subtle increased T2 signal on STIR but a heretrogeneous enhancement pattern following IV gadolinium. Small epidural soft tissue mass behind the body of L4 producing marked thecal compression with bilateral psoas inflammatory swelling and locules of fluid (rim-enhancing) especially on the left indicative of abscess. Note endplates (L3/4 and L4/5) are intact and the discs show no enhancement or fluid as usually seen in discitis. Pus was drained from the psoas muscles at surgery.