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We reviewed the records of 87 patients with a ureterocele associated with duplication and a nonfunctioning upper pole segment. All patients involved in this study were treated by partial nephroureterectomy and observation. Additional surgery to correct vesicoureteral reflux became necessary in 54 cases (62%). A careful retrospective chart and radiographic review identified that the need for additional surgery was directly related to the number of renal moieties that had a ureterocele or vesicoureteral reflux present. In particular, when a ureterocele alone was present 21 of 21 patients (100%) did not require additional surgery. When low grade (less than 3/5) reflux was present into 1 ureter 8 of 15 patients (60%) did not require surgery. The presence of high grade reflux into 1 moiety or vesicoureteral reflux into more than 1 moiety, regardless of the grade of reflux, almost inevitably resulted in the need for further surgery with only 2 of 50 patients (4%) with these abnormalities cured by partial nephroureterectomy alone. Our data suggest that this latter group of patients may be treated more efficaciously by complete genitourinary reconstruction rather than partial nephroureterectomy alone.