Nineteen patients with perinephric abscess were treated during a period of ten years. Eighteen abscesses were cured by drainage performed as soon as the diagnosis had been made. One patient died because the correct diagnosis had not been reached, the correct one being revealed by autopsy. Staphylococcus and gram negative bacilli were equally isolated. Stones were present in thirteen patients. Forty-two per cent of the patients were diabetic. The literature is reviewed.