Living-donor Kidney Transplantation After Resection of Mixed Epithelial and Stromal Tumor: A Positive Outcome Despite Not Observing the Recommended Waiting Period.

Background/Aim: Mixed epithelial and stromal tumor (MEST) is a benign renal neoplasm. For MEST cases requiring kidney transplantation, a waiting period is essential. However, reports on the management of MEST cases awaiting kidney transplantation are limited. We report the case of a patient with end-stage renal disease and bilateral renal pelvic tumors who was pathologically diagnosed with MEST and successfully underwent living-donor kidney transplantation without the recommended waiting period. Case Report: the histopathological examination of the right-sided lesion. Based on this diagnosis, right nephroureterectomy, followed by living-donor kidney transplantation up to the right iliac fossa, was performed 6 months after the left nephroureterectomy. The postoperative course was uneventful, and the patient was discharged on postoperative day 9. No evidence of recurrence or metastasis has been observed during 1 year of follow-up. Conclusion: This case demonstrates that living-donor kidney transplantation without a mandatory waiting period may benefit patients with end-stage renal disease when a definitive diagnosis of MEST is established before transplantation.