Renal abscess caused by Staphylococcus aureus develops from hematogenous spread of the organisms from a primary skin lesion, or is secondary to longstanding renal infection caused by gram negative organisms. Excretory urography is the most reliable investigative procedure although renal arteriogram is necessary frequently. In the early stage, cure is often possible with antibiotic therapy, but if not, surgical operation such as drainage of the abscess, heminephrectomy or even nephrectomy will be required.