Case report: Ureteral Fibroepithelial Polyps causing ureteropelvic junction obstruction in a child with a horseshoe kidney

Abstract BackgroundUreteral Fibroepithelial Polyps (UFPs) are benign tumors that arise from the mesodermal layer. The disease is a rare cause of ureteropelvic junction obstruction (UPJO), particularly in children. Case presentationwe present a case of a child preoperatively diagnosed with UPJO and urogenic sepsis owing to horseshoe kidney using magnetic resonance imaging(MRI). During surgery, we found that the ureteral polyp rather than the horseshoe kidney was the cause of the PUJO.Thenus, the ureteral polyp was resected, and end-to-end anastomosis was performed with the renal pelvis and ureters. An F5 double J tube was indwelling and removed by ureteroscopy three months later. No special adverse events were found during 1-year follow-up. ConclusionsWhen the clinical and radiographic findings of the patient are incompatible with the common etiology, ureteral fibroepithelial polyps should be considered as a rare cause of PUJO.