Isolated atresia of the left main coronary artery in an adult.

A 49-year-old woman with isolated atresia of the left main coronary artery is presented. The patient who suffered from angina underwent myocardial revascularization 14 years after the onset of symptoms. A left internal mammary artery to left anterior descending coronary artery bypass was performed. Twenty months after the operation, the patient is free from angina and leads a normal life. The clinical features, diagnosis and management of the left main coronary atresia in adults are discussed.