Computer tomography has been found to be of value in the study of deformities and narrowing of the spinal canal in 52 patients with Paget's disease of vertebral bodies. To a limited extent it can also be used for evaluating the intervertebral foramina. Deformities of the spinal canal were classified into three degrees of severity. The most severe changes were found in the lower thoracic region. The presence of neurological complications is an indication for CT studies.