A 67-year-old woman was admitted to our hospital for examination of a chest X-ray abnormality. Chest computed tomography and coronary angiography revealed a giant aneurysm and coronary-pulmonary artery fistula originating from both the proximal left anterior descending and the right coronary artery. The fistula was ligated and the aneurysm was resected by means of extracorporeal circulation. The postoperative course was uneventful. Computed tomography and coronary angiography showed that the aneurysm and coronary-pulmonary artery fistula had completely disappeared.