Pars interarticularis defects - multilevel
Low back pain.
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Bilateral pars interarticularis defects at L3 and L5. No listhesis at L3/4. Minimal anterolisthesis at L5/S1.
The most common level of a pars interarticularis defect is L5, followed by L4. Multilevel pars interarticularis defects are infrequent.