A supernumerary kidney is one of the rarest congenital anomalies of urinary tract, approximately 70 cases have been reported. Supernumerary kidneys may be asymptomatic and associated with genital-urinary tract anomalies.
A 6-year old girl was found to have supernumerary kidney with contralateral double kidney from recurrent urinary tract infections (UTI) in her past history while she had hospitalized for bronchopneumonia.
Ultrasonography (USG), pyelography and scintigraphy had demonstrated an extra kidney in the left side with contralateral double kidney. USG is the most valuable method of early diagnosis this anomalie of urinary tract, especially after UTI.
Herein, this rare urinary anomaly was discussed with literature.