Preoperative planning. Spondylolisthesis. Five lumbar type vertebral bodies are presumed to be present. Vertebral body heights are within normal limits. Grade 1 anterolisthesis of L4 and L5 is again seen. Bone marrow signal is benign. The conus medullaris is normal in position.There is developmental narrowing of the lumbar spinal canal with superimposed degenerative changes as described below:L1-L2: No significant disc disease. No spinal canal or neural foraminal stenosis.L2-L3: No significant disc disease. No spinal canal or neural foraminal stenosis.L3-L4: Disc bulge eccentric to the left contributes to mild left neural foraminal stenosis, progressed since 6/24/2011. No significant spinal canal or right neural foraminal stenosis. L4-L5: Postsurgical changes of left-sided fusion as described on recent CT, new since prior MRI. Vacuum phenomena at this level and absence of fusion better appreciated on recent CT. There is mild spinal canal stenosis. Advanced bilateral facet arthropathy. There is up to moderate bilateral neural foraminal stenosis.L5-S1: No significant disc disease. No spinal canal or neural foraminal stenosis. Mild bilateral facet arthropathy.Paraspinous soft tissues are within normal limits.
1. Grade 1 anterolisthesis of L4 and L5 with absence of fusion at this level. There is advanced facet arthropathy and up to moderate bilateral neural foraminal stenosis and mild spinal canal stenosis at this level. Hardware loosening better seen on recent CT.2. Mild left L3-L4 neural foraminal stenosis related to eccentric left-sided disc bulge, progressed since prior MRI from 2011.