Collateralized, occluded left anterior descending artery. (A–C) Angiograms of the left coronary artery (anteroposterior, cranial projection) showing total occlusion of the LAD (black arrow).

Since the left main supplies a very large amount of myocardium, occlusion is often fatal resulting ... main is common and a benign finding (the LAD and circumflex arise separately from the left ...