Endourologic Treatment in Two Cases of Ureteral Valves.

Introduction: Congenital ureteral valves are a rare cause of ureteral obstruction that may lead to renal function deterioration. We present two clinical cases treated endoscopically by monopolar electrocautery and laser fiber ablation. Presentation of Case: The first case is a 13-year-old male with several episodes of abdominal pain and was found to have severe left hydronephrosis. Ultrasonography showed a dilated ureter and pelvicaliceal system with an obstructive renogram curve. We performed a retrograde pyelogram, finding a dilated ureter 5 cm up from the vesicoureteral junction with ureteral valves in that place. Ablation of the valves was conducted using monopolar electrocautery. The second case is a 2-year-old male with left ureterohydronephrosis shown in abdominal ultrasonography. In the radiologic findings, a high-risk pyelocaliceal dilatation with renal parenchyma thinning and a diameter of 3.3 cm for the left ureter is described, with an obstructive renogram. We performed a cystoscopy, observing the presence of valves in the ureter at 3 cm that conditioned an obstruction. The complete section of the valves was performed through a 270μm holmium laser fiber. Our patients made an uneventful postoperative recovery and continue to remain completely asymptomatic. A significant decrease in renal dilation was observed and renal function recovered in both cases. Conclusion: Ureteral valves are an uncommon cause of ureteral obstruction. Advances in endourologic techniques allow us to give a minimally invasive approach to these diseases, obtaining good long-term results in our small series of patients.