A 35-year-old man was admitted 5 years after congenital heart surgery complicated by Staphylococcus aureus and a cutaneous fistula located at the left fourth intercostal space. He was febrile (40 degrees C), suffering from sternal pain and suppuration from the old fistula. During examination arterial blood suddenly discharged from the fistula, so that surgery was immediately instituted. An infected Dacron tube implanting on the ascending aorta for a central aorto-pulmonary shunt was at the origin of a false aneurysm: this had led to the repeat formation of an aorta-cutaneous fistula and outbreak of external bleeding.