Fused supernumerary kidney.

A partially fused supernumerary kidney with bifid ureters was diagnosed in a 35-year-old female patient using ultrasound and triple-phased computed tomography (CT). The CT also revealed two separate renal arteries supplying each of the left kidney and multiple left renal veins, forming a common trunk to drain into the inferior vena cava. Supernumerary kidney is a rare congenital anomaly; fewer than 100 cases have been reported over the years.