Large renal aneurysms can masquerade as simple renal cysts on ultrasound, especially if Doppler examination is not routinely done to assess flow characteristics. We present a case report of a 26-year-old male, as a clinical challenge in urology, who had minimal symptoms, yet had an arteriovenous fistula with a large aneurysm which was diagnosed as a parapelvic cyst on ultrasound. Endovascular treatment of the arteriovenous fistula was done using a vascular plug with satisfactory outcomes.

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