Fig. 5. Spread of contrast medium after the injection of 5 ml (A-1, B-1 ) and 10 ml (A-2, B-2 ) iotrolan, 240 mg I/ml. Epidurograms of A-1 and A-2 were taken from the same patient, and epidurograms of B-1 and B-2 were both taken from another patient.