title: Kidney Allograft Stone after Kidney Transplantation and its Association with Graft Survival.
abstract: BACKGROUND
  It is said that renal transplantation lithiasis is rare. However, literature has some different frequencies in this field and most of the studies related to this issue are case reports. Also the exact effect of this complication on the graft survival rate is not clear.
  
  
  OBJECTIVE
  To determine the prevalence of nephrolithiasis among kidney transplant recipients and evaluate its association with the graft survival.
  
  
  METHODS
  We conducted a retrospective study to determine the prevalence of renal stone among 574 kidney transplant patients aged ≥18 years who had undergone renal transplantation in Baqiyatallah Transplant Center between 1990 and 2010. Cox regression analysis was used to determine the effect of renal stone on the graft survival.
  
  
  RESULTS
  The mean±SD follow-up time was 55±53 months. Kidney stones were diagnosed in 31 (4.4%) of all 574 kidney transplants studied. Cox regression analysis revealed that nephrolithiasis after transplantation had no significant effects on the survival of the transplanted kidney (OR 1.04, CI: 0.708-1.54).
  
  
  CONCLUSIONS
  For the first time, we showed that nephrolithiasis in recipients does not have a significant effect on the transplant survival.
authors: Students' Research Committee, Baqiyatallah University of Medical Science, Tehran, IR Iran ; Nephrology and Urology Research Center, Baqiyatallah University of Medical Science, Tehran, IR Iran.
authors: M S
authors: MS
authors: Rezaee-Zavareh
authors: Students' Research Committee, Baqiyatallah University of Medical Science, Tehran, IR Iran.
authors: R
authors: R
authors: Ajudani
authors: Students' Research Committee, Baqiyatallah University of Medical Science, Tehran, IR Iran.
authors: M
authors: M
authors: Ramezani Binabaj
authors: Nephrology and Urology Research Center, Baqiyatallah University of Medical Science, Tehran, IR Iran.
authors: F
authors: F
authors: Heydari
authors: Nephrology and Urology Research Center, Baqiyatallah University of Medical Science, Tehran, IR Iran.
authors: B
authors: B
authors: Einollahi
keywords: Calculi; Graft survival; Kidney transplantation; Lithiasis