A man aged 72 years was admitted to this institution complaining of chest discomfort and exertional breathlessness. A soft, continuous murmur was audible at the upper left sternal border. The chest roentgenogram showed enlargement of the heart. Transthoracic echocardiography demonstrated anomalous origin of the left coronary artery from the pulmonary artery, which was associated with a retrograde blood-flow signal from the left coronary artery to the pulmonary artery by color flow mapping. Intramyocardial coronary flow at the interventricular septum showed a retrograde velocity pattern with two peaks in systole that were more dominant in diastole. Transesophageal echocardiography demonstrated a dilated right coronary artery originating from the sinus of Valsalva. A dilated left coronary artery was also detected, and color flow mapping showed it to be associated with retrograde coronary blood flow. This was not connected to the sinus of Valsalva. Aortography demonstrated the dilated right coronary artery supplying the retrograde collateral circulation flowing to the left coronary artery with slight opacification of the main pulmonary artery. We thus diagnosed this condition as a long-surviving case of Bland-White-Garland syndrome.