Bilateral supernumerary kidney with an obstructive calculus: An extremely rare case report and literature review.

Bilateral supernumerary kidneys and associated urinary stone disease are rarely seen in clinical practice, and only three cases have been reported in the literature to date. We report a 15-year-old male patient having a bilateral supernumerary kidney with an obstructive left ureteric stone successfully managed with retrograde intrarenal surgery. Stones in such anomalous kidneys pose a challenge for the urologist, and imaging is essential for surgical intervention planning. RIRS with holmium laser lithotripsy is a safe and effective treatment with a high single-stage stone-free rate and low complication rate in experienced hands.