Evaluate spondylolisthesis on flexion/extension views. Evaluate L5 on S1 displacement. Based on prior examinations, I will designate 5 lumbar type vertebrae with partial sacralization of L5. There is hyperlordosis of the lumbar spine, as well as a mild scoliosis which limits evaluation of the lower lumbar vertebrae and intervertebral disk spaces. Although there appeared to be an anterolisthesis of L5 relative to S1 on the prior lumbar spine radiograph study, the subsequent CT and MRI studies showed no such anterolisthesis, and therefore the appearance is likely artifactual, perhaps related to the partial sacralization of L5. There is, however, a grade 1 to 2 anterolisthesis of L4 on L5 which measures approximately 12 mm on flexion and 10 mm on extension (not accounting for magnification artifact). Vertebral body heights are preserved.
L4 anterolisthesis as described above.