Months of low back pain.
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Mild anterolisthesis of L5 on S1. Lucencies through both pars interarticularis of L5.
Spondylolisthesis is a relatively common cause of low back pain in adolescents. Although often in this age group, the presentation may be with a stress injury of the pars interarticularis without an established osseous defect. This will be occult on x-ray but seen on MRI.