Abstract
INTRODUCTION: Ureteral fibroepithelial polyps are extremely rare and cause ureteropelvic junction obstruction in the pediatric population. Recent advancements in endoscopic treatment, such as holmium:yttrium-aluminum-garnet laser, have created more options for practitioners to treat multiple ureteral fibroepithelial polyps cases. However, the use of holmium:yttrium-aluminum-garnet laser multilobulated ureteral fibroepithelial polyps may have technical difficulties. CASE PRESENTATION: An 11-year-old boy with intermittent right flank pain revealed multiple ureteral fibroepithelial polyps approximately 3 cm long at the right ureteropelvic junction. The ureteral fibroepithelial polyps were resected using flexible ureteroscopy using thulium:YAG laser. A second-look ureteroscopy revealed no recurrence, residual polyps, or ureteral stricture. At 1-year follow-up, ultrasonography showed no hydronephrosis on the affected side. CONCLUSION: Thulium:YAG laser provides clear visibility due to its high hemostatic and evaporation effects. To the best of our knowledge, this is the first pediatric case of multiple ureteral fibroepithelial polyps successfully treated with endoscopic resection using thulium:YAG laser, with a favorable clinical outcome.