Fig. 2.

Case 2. a CT reconstruction images. Preoperative CT image (left) shows a massive segmental type OPLL at C4-5, and postoperative CT image (right) shows resection of OPLL. b Axial CT scans. Preoperative CT scan (left) shows a typical double-layer sign, and postoperative CT scan (right) shows residual of dural ossification (DO) and anterior shifting. c MR images. Preoperative MR image (left) shows insufficient decompression of the spinal cord after unsuccessful laminoplasty, and postoperative MR image (right) shows sufficient decompression of the spinal cord