Primary vesicorenal reflux (P.V.R.R.) is the most important cause in the pathogenesis of chronic pyelonephritis, better known in medical literature as "reflux nephropathy". The Authors stress out the criteria adopted in their Center for surgical treatment of P.V.R.R. and report the results in 1158 refluxing ureters (858 children) operated on. In 5 ureters an ureteronephrectomy and in 1153 remaining ureters and ureteral reimplantation was carried out. About 57% of ureters operated on was affected by severe reflux (IV - V grade). The Authors obtained 98.6% of surgical successes. In 16 ureters operated on, stricture (9 ureters) and reflux (7 ureters) were postoperatively present. The percentage of successes in infants less than 2 years old at operation was 98%.
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