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MRI confirmed the infection to originate from the T12-L1 intervertebral disc, with an enhancing epidural abscess compressing the spinal cord, as well as the large retroperitoneal abscess - this involved the left psoas muscle and also the left erector spinae muscle. There is also a prevertebral subligamentous component. The left kidney is displaced laterally. The MRI also shows bone oedema involving both the T12 and L1 vertebral bodies.