 The last well formed disk space is referred to as L5-S1. There is mild straightening of the lumbar lordosis. There is 2-mm retrolisthesis of L4 and L5. There is desiccation of the L4-5 and L5-S1 disks with moderate to severe loss of disk heights with type II degenerative endplate changes at L5-S1. The conus terminates at L1-2 and is within normal limits of size and signal intensity.T12-L1: No disk herniation or spinal stenosis. L1-2: No disk herniation or spinal stenosis. L2-3: No disk herniation. Ligamenta flava thickening and mild facet arthrosis with no significant spinal stenosis.L3-4: Mild disk bulge, ligament flava thickening and moderate facet arthrosis causing mild bilateral foraminal narrowing without significant spinal canal stenosis.L4-5: Diffuse disk bulge and osteophytic ridging of the endplates, and moderate facet arthrosis with ligamenta flava thickening causing moderate to severe spinal canal stenosis, and moderate bilateral subarticular and neural foraminal stenosis.L5-S1: Diffuse disk bulge and moderate facet arthrosis causing mild bilateral neural foraminal stenosis and no significant spinal canal stenosis.
Multilevel lumbar spondylosis as described above, worst at L4-5 where there is moderate to severe spinal canal, and moderate bilateral subarticular and neural foraminal stenosis.