Renal abscess is uncommon and has variable symptoms of insidious onset. The most common pathogens are Escherichia coli. The patients with renal abscess usually present with fever, chills, abdominal or flank pain, and occasionally weight loss and malaise. Renal abscesses can be treated in various fashions. In these patients, renal abscess with hydronephrosis that does not respond to antimicrobial therapy was improved with double J catheter insertion.