Supernumerary kidney

Case contributed by Dr MT Niknejad


Work up for abdominal pain.

Patient Data

Age: 55 years
Gender: Female

The supernumerary kidney is present on the left side. A small kidney is seen in the left renal lodge, and another kidney is located at the left paramedian of the pelvis with anteriorly rotated hilum. Both left-sided kidneys drainage into the urinary bladder with a single ureter.

The urinary collecting system of the right kidney is duplicated.

Case Discussion

Supernumerary kidneys, also known as accessory kidneys, are a rare congenital anomaly of the urogenital system, and less than 100 cases have been documented in the medical literature.

Patients are usually asymptomatic, and most of them are located on the left side. Management is symptom-based. 

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