32 paediatric patients requiring myelography were studied with iohexol 210 mgI/ml (n=15) and iohexol 180 mgI/ml (n=17). Visualization was good or excellent in over 90 of the group receiving the higher concentration and in over 83 of the lower. There were no side effects in either group and vital signs were not significantly altered during the procedure. In the majority of patients (14/18) who had CT, additional diagnostic information was obtained. Iohexol 180 mgI/ml is preferred for routine use, but 210 mgI/ml may give superior visualization with no apparent added risk. Procedural technique and good communication with the patients and their families may have contributed to the absence of side effects.
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