Myelopathy due to Calcification of Yellow Ligament. (Report of 4 cases).

We present 4 cases of cervical myelopathy caused by the calcification of the yellow ligament. All cases were female and teir average age was 62 (range: 53 to 73) years. Plain radiographs showed round-shaped calcification in the spinal canal; 2 between C5/6, Ibetween C6/7, and 1 between C3/4, C4/5, and C5/6 from the lateral view. Computed Tomography (CT) clearly showed high density tumor-like mass at the sites corres pording to the plain radiographs which compressed the spinal cord. Laminoplasty from C3 to C7 was employed for operative treatment and produced good result in all cases.