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The illustration demonstrates an L4–L5 partial laminectomy (coronal hemilaminectomy) with medial facetectomy/foraminotomy that deliberately spares the pars interarticularis bilaterally, overlying the pedicles (P), to enhance stability. Observe the decompression of the thecal sac (DURA) and bilateral inferiorly exiting L5 nerve roots (R) that are now free in the lateral recesses. For the smaller synovial cysts, such a single-level decompression may suffice
