Supernumerary kidney

Supernumerary kidneys are a rare congenital anomaly of the urogenital system, where there are one or two accessory kidneys.

Less than 100 cases are documented. 

Patients may be asymptomatic. If present symptoms range from fever, pain to abdominal mass. These symptoms are mostly due to related renal pathology such as hydronephrosis, pyelonephritis, malignant tumors or calculus disease.

Urogenital anomalies such as fusion anomalies, ectopic ureteric opening, vaginal and uretral atresia, urethral or penile duplication. 

Non-urogenital anomalies such as coarctation of aorta, imperforate anus, ventricular septal defects and meningomyelocoele are also associated with supernumerary kidneys. 

Most of the kidneys are on the left and most often caudal to the native kidney. Mostly the accessory kidney is smaller in size with reduced excretion. Evaluation may be done by ultrasound, IVU, CT , MRI and Nuclear Medicine studies like DMSA and DTPA scans. Ultrasound is useful in the morphological characterization while the rest aid in functional assessment.

Management is symptom based.  For asymptomatic patients regular ultrasound follow up and USG with excretory function assessment is suggested if patient is symptomatic. 


Anatomy: Abdominopelvic

Anatomy: Abdominopelvic

Article information

rID: 25303
System: Urogenital
Section: Anatomy
Synonyms or Alternate Spellings:
  • Accessory kidney

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Cases and figures

  • Case 1: supernumerary kidney
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  • Case 2: Supernumerary kidney
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