Status post fusion, left radicular pain. Five lumbar type vertebral bodies are presumed to be present. Vertebral body heights are within normal limits. There is minimal anterolisthesis of L5 on S1 which is similar to prior. Alignment is otherwise within normal limits. Bone marrow signal is benign. The conus medullaris is normal in position. Compared to MRI 6/16/2015, interval postsurgical changes of spinal fusion at L5-S1 is seen. Paraspinous rods, pedicle screws, and interbody spacer have been placed which are better seen on recent lumbar spine CT from 6/22/2015.Multilevel degenerative changes are seen, 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: Mild disc bulge again seen without significant spinal canal or neural foraminal stenosis.L4-L5: Minimal disc bulge. No spinal canal or neural foraminal stenosis.L5-S1: Previously seen disc bulge is decreased in prominence. The spinal canal and right neural foramen are patent. Left neural foramen is suboptimally visualized due to susceptibility artifact from the hardware but appears surgically decompressed. Evaluation for scar tissue in the left neural foramen is very limited due to artifact. No obvious epidural scar tissue is appreciated in the spinal canal. Facet arthropathy is better seen on recent postoperative CT.Paraspinous soft tissues are grossly unremarkable. No hematomas within the spinal canal or fluid collections within the paraspinous soft tissues. No MRI evidence of arachnoiditis.
Postsurgical changes of spinal fusion at L5-S1. There is no significant spinal canal or neural foraminal stenosis which is evident. The left L5-S1 neural foramen, which was previously narrowed, is suboptimally assessed due to artifact but appears surgically decompressed. 