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Supernumerary kidney is a highly uncommon congenital anomaly characterized by the presence of at least 1 or more extra kidneys in variable positions and morphology. Due to the scarcity in the medical literature, not much is known about this condition. The additional kidney typically has its own collecting system, vascular supply, and distinct encapsulated parenchyma. In this case, we present a 38-year-old male with a right supernumerary kidney who was initially investigated for a renal artery aneurysm. In the case of our patient, the discovery of a supernumerary kidney influenced the course of management and prevented unnecessary intervention and procedure. This emphasizes the importance of thorough imaging and diagnostic techniques in patients to accurately identify and characterize such anomalies.