01746nas a2200205   4500008003900000245006900039210006900108260000800177300000700185490000700192520120700199100000501406700001501411700001501426700001401441700001401455700001201469700001401481856004501495       2009                          d00aSarcomatoid renal cell carcinoma in a renal transplant recipient0 aSarcomatoid renal cell carcinoma in a renal transplant recipient  cDec  a220 v413 aThe incidence of transplanted kidneys derived from elderly donors is increasing because of the larger waiting lists and greater age of patients with end-stage renal failure. Compared with young donors, one of the problems is the heightened risk of neoplasm transmission. We report 2 cases of kidney recipients, both of whom developed a sarcomatoid renal cell carcinoma after receiving a kidney transplant from the same 68-year-old male donor, who did not show signs of a neoplasm on a previous abdominal ultrasound or a pretransplant biopsy. The first recipient was a 66-year-old woman who developed a kidney mass with several urologic obstructive complications, tumor dissemination, and death at 9 months after kidney transplantation. The second recipient was a 48-year-old asymptomatic man with normal renal function, who was studied after the results of the first recipient, revealing another renal tumor. Transplant nephrectomy was performed and a peritoneal implant was resected. The patient is alive without evidence of a neoplasm after 18 months. Herein we have discussed the mechanisms of neoplasm transmission in kidney transplantation and possible strategies for its prevention and treatment.1 a1 aSalinas, A1 aVirseda, J1 aPérez, J1 aOrtega, A1 aNam, SH1 aGómez, C  uhttp://613633.bywedr.asia/reference/4715