The spread of analgesic and local anesthetics in the epidural space was demonstrated in 13 patients by computed tomography examinations performed after lumbar epidural injection of radiographic contrast material via a percutaneous catheter. TTie volume of contrast material was equal to the volume of analgesic.As a result, the upper level of contrast material was found at upper thoracic segments (T4 and above) in 6 of 13 patients (46%). middle thoracic segments (between T5 and T8) in 4 of 13 patients (31 % ) and lower- thoracic segments (between T8 and Tl2) in 3 of 13 patients (23%).