Since the epidural catheterization has been widely used for the purpose of anesthesia, diagnosis and pain control, there are various undesirable complications and hazards through the technical procedure or catheterization itself. Authors have experienced several hazards of location of the epidural catheter tip which were detected by epidurography performed the 1st. or 2nd. postoperative day with 50% Angiograffin. Hazards were as follows; 1) Single air bubble in the epidural space. 2) Inappropriate placement of the catheter tip. 3) Kinking of catheter in the epidural space. 4) Intravascular placement of the catheter.