Using Retrograde Intrarenal Surgery for Managing Staghorn Renal Stones.

Inclusion Criteria: * Adult patients of both sexes. * Patient has a staghorn renal stone (complete or partial staghorn). * Normal renal function tests. * Congenital renal anomalies as horseshoe, pelvic or mal-rotated kidneys. Exclusion Criteria: * Abnormal coagulation profile. * Active or untreated urinary tract infection. * Age under 18 years or above 70 years. * Patient has a staghorn stone associated with other pathology which requires additional intervention, as ureteral stricture or ureteropelvic junction obstruction (UPJO). * Pregnancy.