A clinical study of computed tomographic myelography with metrizamide was performed in 41 patients operated for cervical spondylotic myelopathy. Anteroposterior (AP) diameter and area of the spinal cord were measured at intervertebral levels. The correlation between these factors and clinical symptoms and surgical results were examined. Results were as follows: 1) AP diameter and area of the spinal cord at the most severely affected level were less than 5mm and 55mm2 deformity and the severity of symptoms; and 3) There was no good correlation between the degree of cord deformity and recovery of symptoms after surgery.
