It is well known that the computed tomography (CT) is very useful in identifying the boy structures and adjacent soft tissues of the spine. We have studied 69 cases of spine CT with EMI-CT 5005 whole body scanner from Oct. 1977 to Aug. 1979 . The results were as follows : 1. CT of the spine provided the normal cross sectional anatomy which was not shown by the conventional radiographies including tomogrpahy. Spinal canal consists of ossesous and articular segments. 2. CT of the spine permitted the diagnosis of hypertrophy of superior and inferior facets and adjacent lamina, causing encroachment into the lumbar spinal canal, which was often not shown by the conventional examinations. 3. In tumorous conditions, CT demonstrated more precise localization, contour and extent of intra and extra-spinal tumor. 4. Under CT guidance, exact pathologic diagnosis could be made by percutaneous needle biopsy, and therapeutic percutaneous needle aspiration was possible in case of cyst or abs ess. 5. We experienced one case of intramedullary astrocytoma enhancing homogenously by contrast medium injection. 6. The followings are though the be important limitations of the spine CT. First, the distinction of spinal cord from subarachnoid space and distinction of nerve root pouches is difficult and misleading due to artifact and computer program limitations related to the encircling bone. Second, precise and reproducible positioning is difficult to achieve. Third, without coronal or sagittal scanning (or reconstruction), the important longitudinal dimension of the spinal canal is difficult to appreciate fully.