Pars interarticularis defect and spondylolisthesis
Chronic lower back pain
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Lateral projection shows L3 pars interarticularis defects and grade 1 spondylolisthesis of L3 on L4.
This case demonstrates bilateral L3 pars defects (spondylolysis), which is unusual as >95% of these defects occur at either L4 or L5.