Incidental Splenic Cyst Simulating A Supernumerary Kidney

Abstract

This case represents an incidental splenic cyst misinterpreted as a supernumerary kidney, resulting in a computed tomography scan to confirm the ultrasound (US) findings. A 55-year-old man presenting with renal failure had an US examination which showed a mass adjacent to the left kidney. It resembled a kidney with a dilated collecting system rather than a spleen. Supernumerary kidneys are extremely rare in the published literature. Splenic cysts are more common, but are still relatively unusual. The possible diagnoses and US findings in splenic cysts are discussed.