Nephroid metaplasia of a graft kidney

Background. Nephroid metaplasia is a benign and rare lesion that is confine d to the lamina propria of the urinary tract. The leading cause of these le sions is previous trauma to the urothelium. Method. We report a case of nephroid metaplasia of a graft kidney from a li ving-unrelated donor. This patient presented to our clinics due to painless gross hematuria 1 month after renal transplantation. Result. Although malignancy was suspected in the beginning due to a filling defect demonstrated by urography, only percutaneous excision of the tumor was performed to preserve the renal function. However, the pathological res ult disclosed nephroid metaplasia. Conclusion. Hematuria warrant aggressive evaluation because underlying mali gnancy in a immunocompromised patient might be relatively progressive.