Diffuse marrow edema with end plate erosions and mild compression of inferior end plate of L5/S1. The intervertebral disc space is grossly reduced with secondary loss of internal architecture and signal abnormality.
Large volume collection with enhancing walls noted to involve the entire left ilio-psoas major muscle. This collection is seen to breach its ipsilateral quadratus lumborum and anterior / middle lumbo-dorsal fascia to extend into the subcutaneous plane. Collection also enters into the prevertebral space from L5 to S2 level.