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(A) Preoperative computed tomography scan shows normal size of laminar. (B) Postoperative computed tomography scan shows decompression of ipsilateral approach without damage of facet joint. Contralateral approach is recommended in case of (C) vertebral rotation, (D) the width of laminar space is narrow. (E) Postoperative computed tomography scan shows decompression of spinal canal without damage of facet joint after contralateral approach procedures.
