The article reports a case of congenital ureteral diverticulum found by chance at dynamic IVU with fluoroscopy. The diagnosis was confirmed at non-contrast MR tomography, CT and repeated target ultrasonography using color Doppler mapping and 3D. This is the first description in the Russian literature of ultrasound, IVU with fluoroscopy and non-contrast MR urography findings before and after intravenous injection of 2.0 ml lasix on MR tomograph in ureteral diverticulum.