History of lumbar fusion: back and left leg pain. There are postoperative findings related to posterior fusion with pedicle screws and interconnecting rods at the L5-S1 level. Artifact related to the surgical hardware limits the assessment of adjacent structures. There is bilateral spondylolysis at L5 with minimal anterolisthesis of L5 upon S1, as well as mild loss of disc space height at this level. Loosening and fracture of the S1 screws is better delineated on the prior CT. There is no definite evidence of neural foraminal or spinal canal stenosis. The vertebral body heights are preserved. The imaged portions of the spinal cord and cauda equina nerve roots appear unremarkable. The vertebral bone marrow signal appears unremarkable beyond the portions obscured by surgical hardware artifact. Aside from expect postoperative findings in the lumbosacral region, the paraspinal soft tissues appear to be unremarkable.
1. Postoperative findings related to posterior fusion with pedicle screws and interconnecting rods at the L5-S1 level. Artifact related to the surgical hardware limits the assessment of adjacent structures and loosening and fracture of the S1 screws is better delineated on the prior CT. 2. Bilateral spondylolysis at L5 with minimal anterolisthesis of L5 upon S13. No definite evidence of neural foraminal or spinal canal stenosis.