Case Report: Reporting a novel variant of type VI dual left anterior descending artery: a rare coronary anomaly

摘要

A dual left anterior descending artery (LAD) is a rare congenital coronary anomaly and is classified into six types based on the origin and course of the long LAD. In type VI dual LAD, the short LAD arises from the left main coronary artery, and the long anomalous LAD, from the proximal right coronary artery (RCA), coursing between the right ventricular outflow tract and aortic root to reach its normal course in the mid interventricular groove. We present a novel variant of type VI dual LAD where the course of the long LAD is the same but the origin is not from the RCA but, instead, separately, from the right coronary sinus.