Fig. 1

Computed tomography of lumbar spine and psoas abscess on day 5, the day after meropenem and vancomycin were initiated. a A coronal image showing low density area in the lateral part of left psoas major; b a sagittal image showing several bone pieces in the intervertebral area of L2/L3 and swelling of the disc. Although he had received two prior surgeries in his lower lumbosacral spine from L4 to S2, there was neither fracture nor abscess around the instruments