Numbness in right shin/knee and top of foot. History of spondylolysis. Five lumbar type vertebral bodies are present. Chronic pars defect at left L4 again noted, better seen on prior CT. Vertebral body heights are within normal limits. Alignment is within normal limits. Bone marrow signal is benign. The conus medullaris is normal in position at lower L1 level.There appears to be mild congenital narrowing of the mid to lower lumbar spine. Superimposed degenerative changes are seen, as described below:L1-L2: No significant disc disease. No significant spinal canal or neural foraminal stenosis.L2-L3: No significant disc disease. No significant spinal canal or neural foraminal stenosis.L3-L4: There is disc dessication with dorsal annular fissure, and disc protrusion. There is moderate spinal canal stenosis including effacement of the bilateral lateral recesses. Minimal bilateral neural foraminal stenosis. Findings are new since 11/9/2007.L4-L5: Disc dessication and bulge, which are new since 11/9/2007. Mild bilateral neural foraminal stenosis. No significant spinal canal stenosis.L5-S1: No significant disc disease. No spinal canal or neural foraminal stenosis.Paraspinous soft tissues are within normal limits.
1. Disk protrusion at L3-4 with associated moderate spinal canal stenosis including effacement of the bilateral lateral recesses. Finding is new since prior MRI.2. Mild foramina narrowing at L3-L4 and L4-L5 as described above. No high grade neural foraminal stenosis.3. Chronic left L4 pars defect as seen on prior CT. No spondylolisthesis.