The aim of the article is to present a case of incidental renal cell carcinoma in living donor kidney, which was successfully transplanted following resection of carcinoma. A 38-year-old female recipient with end-stage renal disease was on maintenance hemodialysis for 4 months. The donor was her mother aged 60 years. Preoperative renal scintigraphy, aortography, and ultrasound examination confirmed good function of donor kidneys. The reason for transplanting the right kidney was slightly diminished phase of secretion revealed by scintigraphy. On February 14, 2001, mother's right kidney was removed, and after hypothermic perfusion, yellowish nodule in the upper part of the kidney was found. Microscopic investigation of the resected material revealed renal clear cell carcinoma. Decision on complete tumor resection was based on the findings of microscopic examination. After suturing the resected segment, mother's kidney was transplanted successfully. The postoperative course was normal in the donor and the recipient as well. Cyclosporine A was replaced with Rapamune. No tumor recurrence was seen for more than 6 years after transplantation, and transplant function was normal.