Fig. 1. Preoperative images. T2-weighted sagittal (A) and axial (B) MRI show a dorsal indentation of the spinal cord at C7 and an intramedullary high-intense lesion at C5–C7. Sagittal (C) and axial (D) CT myelograms show an enlarged CSF space below C7 compressing the spinal cord on the back at C7. CSF: cerebrospinal fluid, CT: computed tomography, MRI: magnetic resonance imaging.