A solitary urothelial tumor arising from one of bilateral ureteroceles

A ureterocele is a congenital defect of the ureter. Based on available autopsy reports, the highest incidence of ureteroceles has been reported as 1 in 500, occurring four to six times more commonly in females than in males. It can occur in up to 95% of females with a duplex collecting system (1, 2). Ureteroceles in adults usually arise within a single renal system with no or mild obstruction. They may present as recurrent urinary tract infections, flank pain or remain asymptomatic, only to be picked up incidentally via imaging. Stasis and infection may predispose to calculus formation in the ureterocele and upper urinary tract (3). The association of a ureterocele with a tumor is very uncommon. In this paper, we report a unique case of a tumor arising within one of bilateral ureteroceles.