Computed tomography of the lumbar thecal sac.

With a high resolution modification of a translate--rotate body scanner (EMI CT5005), radiologists may now demonstrate the epidural fat, thecal sac, and axillary pouches of the lower thoracic, lumbar, and sacral spinal canal without using contrast agents. Preliminary results with a newer rotary motion scanner (EMI CT7070) suggest that this scanner achieves sequally good delineation of intracanalicular anatomy.