Figure 1: (a) Normal appearance of the thoracic spinal canal. Midline sagittal T1-weighted image; (b) midline sagittal T2-weighted fast spin echo image. 1: Vertebra, 2: normal intervertebral disk, 3: spinal canal, 5: spinal cord, 6: spinous process, 7: anterior longitudinal ligament, 8: posterior longitudinal ligament, 9: interspinous ligament, 10: supraspinous ligament