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Lateral (a and b) radiographs of a 38-year-old male with isthmic spondylolisthesis grade 1. The preoperative MRI (c) showed herniated disc and narrow disc space. Quadrant retractor system (d) was placed and attached with the light cables. Anteroposterior (e) and lateral (f) views after MiTLIF and percutaneous pedicle screw fixation showed reduction of the spondylolisthesis and restoration of the disc space height. Small skin incision (g)
