DDD, HNP: History of low back sprain 10/13/16. There are small central disc protrusions at L4-5 and L5-S1 with loss of disc space height and fluid signal and mild spinal canal, as well as mild neural foraminal stenosis bilaterally at L5-S1. There is no significant spinal canal or neural foramen stenosis at T12 through L4. There are bilateral L5-S1 pars interarticularis defects and approximately 5 mm of L5 upon S1 anterolisthesis. The vertebral body heights are preserved. The vertebral bone marrow signal is unremarkable. The spinal cord displays normal signal and morphology. The paravertebral soft tissues are unremarkable.
1. Degenerative spondylosis at L4-5 and L5-S1 with mild spinal canal. 2. Bilateral L5-S1 pars interarticularis defects and approximately 5 mm of L5 upon S1 anterolisthesis, which contributes to bilateral neural foraminal narrowing at this level. 