Urinary tract infections (UTI) are a common and important clinical problem in childhood.Upper urinary tract infections (ie, acute pyelonephritis) may lead to renal scarring, hypertension, and end-stage renal disease.Pathogenesis of acute pyelonephritis (APN) is associated with urinary tract anatomy and function, bacterial virulence factors, the host innate immune system and production of free radicals. Oxygen-free radicals and oxidative stress play a role in renal scar formation after an APN. Oxygen-free radical scavengers and antioxidants can reduce tissue damage and renal scaring during acute pyelonephritis.we want to publish a study that indicates that antioxidant therapy with omega-3 given to children with pyelonephritis may indeed lower the risk for renal scarring.