Staghorn stones in renal graft. Presentation on two cases report and review the bibliography.

Objective: To describe two clinical cases of staghorn stones in renal allografts and to perform a review of this condition.
Methods/results: Case 1. 71-year-old woman with a renal transplant and recurrent UTI presented lithiasis in the graft on renal ultrasound. We started medical treatment and later one ESWL session was performed. The subsequent evolution of the patient was bad, requiring transplant nephrectomy. Case 2. 68-year old woman with renal transplant presented acute deterioration of renal function due to staghorn stones. Emergency ureteral catheter insertion was carried out, medical treatment was started and after one ESWL session she had a good subsequent evolution and normal function of the graft.
Conclusions: Staghorn stones occupy most of the collecting system. They are usually made of struvite. They form in the context of urinary tract infections caused by urea splitting germs. Long-term persistence of staghorn calculi in the kidney causes functional and anatomical deterioration that can lead to kidney loss.