The normal urinary collecting system develops from a single ureteric bud arising the mesonephric (Wolffian) duct. migrates to meet primitive kidney (metanephros), where it into system. Abnormalities in signaling pathways are thought result variety of variants, including two buds duct (complete duplication) or one that bifurcates during development (incomplete duplication).1Uetani N. Bertozzi K....