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Case 4. Sagittal (A) and axial (B) computed tomography shows diffuse idiopathic spinal hyperostosis (C2–T1) and mixed-type ossification of the posterior longitudinal ligament (C3–C7). Postoperative plain lateral radiograph (C) shows postoperative posterior spinal instrumentation and fusion (C2–T2) with laminectomy (C3–C7).
