Objective: To compare the outcomes of transurethral incision (TUI) and upper pole partial nephrectomy (PN) in patients with duplex system ureterocoele (DSU).

Patients and methods: We retrospectively reviewed the medical charts of patients who presented with DSU in the first-year of life and were managed with either TUI or PN. Patients' demographics, ultrasonography examinations, voiding cystourethrogram studies, and dimercaptosuccinic acid scans were reviewed. Also, the postoperative vesico-ureteric reflux status and febrile urinary tract infection occurrences, and subsequent surgical interventions were identified. The outcomes for the DSU location (intravesical vs extravesical) were compared.

Results: Between January 1995 and September 2015, 44 patients underwent TUI (31 patients) or PN (13). The TUI patients presented at a median age of 1.1 months and were followed-up for a median of 47.4 months, whilst those who underwent PN presented at a median age of 1.06 months and were followed-up for a median of 44.23 months. Postoperatively, in the TUI group, four of 15 units had improved renal function and 11 units had stable function. In the PN group, five of nine units had stable renal function and the remaining four had worsened function (P = 0.019). Furthermore, 15 of the 31 patients (48%) in the TUI group required second interventions compared with one of 13 patients in the PN group (P = 0.01). There was no significant difference between the outcomes of intravesical and extravesical DSUs after TUI and PN.

Conclusion: This study shows significant renal function preservation with TUI compared to PN. However, secondary surgical interventions were higher with TUI.