[A case report of bypass grafting for coronary atherosclerosis with anomalous origin of the left coronary artery from the right coronary artery ostium-anterior subtype].

A 73-year-old female began to suffer from effort-induced chest pain and later disabling angina pectoris. Coronary angiographic evaluation disclosed that both the right and left coronary arteries originated from the right sinus of Valsalva. The dominant right coronary artery had a normal course with a 90% narrowing in the first segment. The left main trunk crossed anteriorly the pulmonary artery conus, thereafter dividing into the left anterior descending and circumflex coronary arteries with two 99% narrowings in the seventh and eleventh segment. She underwent bypass of the left anterior descending and right posterior descending coronary arteries with the left interthoracic artery, the right gastroepiploic artery, and saphenous vein graft on cardiopulmonary bypass support. The postoperative course was uncomplicated.