Fused Supernumerary Kidneys with S-shaped Configuration: A Case Series

Supernumerary kidneys are considered as rare congenital renal anomalies (0.04%). Hereby, the authors present a case series comprising of three patients with incidentally discovered supernumerary kidneys on cross-sectional imaging. The first case of 65-year-old male presented with an anterior abdominal mass which turned out to be plexiform neurofibroma and incidentally diagnosed with right supernumerary kidney and type VIII variant of celiac artery. The second 21-year-old male patient came with suspected appendicitis and a supernumerary kidney was found on the left-side. The third case of 45-year-old female presented with abdominal pain and an incidental supernumerary kidney was diagnosed on cross-sectional imaging. Patients were asymptomatic without urinary complaints, were kept under observation, and did not require any treatment regarding supernumerary kidneys. These cases highlight the potential for incidental detection of supernumerary kidneys and the importance of distinguishing them from other renal anomalies/lesions. Regular follow-up is recommended for monitoring potential complications.