Nineteen years survival after occlusion of the left main coronary artery by virtue of an anomalous septal branch.

This case presents a patient who survived 19 years with an occluded left main coronary artery as a result of collateral flow to the anterior wall from an anomalous septal branch arising from the right coronary artery. The case illustrates that minor variations in coronary anatomy may have important effects on the prognosis of a patient.