Here we report a female patient with diabetes who underwent right nephrectomy 18 years ago for pyonephrosis and renal stone formation. Before she was performed the right nephrectomy, a ureteral calculus impacted in the right ureteral stump was diagnosed. However, after 18 years, a right ureterocutaneous fistula was diagnosed, and the calculus was still found in the ureteral stump of the patient. As a result, a fistula caused by the ureter-impacted calculus was highly suspected. We successfully performed a right ureterectomy, fistulectomy, and debridement on the patient. From our experience in this case, we strongly recommend that a calculus impacted in the ureteral stump should be removed to prevent the occurrence of postoperative complications such as ureterocutaneous fistula.
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