CT
About 14 x 10 x 10 mm low density cystic lesion adjacent to the L3-4 disc in the right paracentral-subarticular zone. The lesion causes mild indentation of the posterior cortex of the L4 vertebra, and resultant cortical thinning.
Moderate degenerative changes of the lumbar spine and intervertebral discs, multisegmental disc bulge most prominent on the L3-4 disc. Narrowing of bilateral L5 nerve root foramina, status post prior disc surgery in the left subarticular zone.