99Tcm-mercapto acetyl triglycine in paediatric renal tract disease.

The use of 99Tcm-mercapto acetyl triglycine (99Tcm-MAG3), a new hippuran substitute, has been reported widely in adults but not in children. Our experience of its use in 100 infants and children for renography and indirect micturating cystography (IMC) is reported. The average age was 5.6 years. 65 patients completed IMC studies and nine patients had 99Tcm-dimercaptosuccinic acid (99Tcm-DMSA) scans performed on the same day. The majority of patients were referred for the investigation of urinary tract infection. 32 kidneys were found to be scarred on 99Tcm-MAG3 scans, 17 kidneys and ureters refluxed on IMC and 14 kidneys were obstructed. The results of 99Tcm-MAG3 scans were compared with those of other urinary tract investigations including ultrasound, micturating cystography (MCUG), intravenous urography (IVU) and 99Tcm-DMSA scintigraphy. No kidney which was scarred had a normal 99Tcm-MAG3 scan. All significant degrees of dilatation or obstruction on IVU or ultrasound were also detected by 99Tcm-MAG3. 99Tcm-MAG3 gave more information than any other single imaging modality and we believe it represents an ideal initial screening test in the investigation of urinary tract infection in older toilet-trained children.