The prevalence of delayed reactions to nonionic contrast medium is higher in patients who have received IL-2 than in the general population.

The nonionic contrast media may elicit coronary artery vasoconstriction, although there are few side effects including anaphylactic in comparison with the ionic contrast media.

After confirming the appropriate spinal needle position, a slow injection of up to 5.0 ml of nonionic contrast material was carried out.