Coronary artery anomalies overview: The normal and the abnormal

Figure 3 Schematic representation of normal coronary anatomy[11]. A: Coronary segments scheme proposed in SCCT guidelines for the interpretation and reporting of coronary computed tomography and used by Society of Cardiovascular Computer Tomography; B: Schematic representation of the coronary arteries. C: Circumferential polar plot of the 17 myocardial segments[56] with corresponding coronary artery territories. A-1, 2 and 3: Proximal, mid and distal RCA; 4: Right posterior descending artery; 5: Left main coronary artery; 6, 7 and 8: Proximal, mid and distal LAD; 9 and 10: First and second diagonal branches; 11: Proximal LCX; 12: First obtuse marginal branch; 13: Mid and distal LCX; 14: Second marginal branch; 15: Left posterior descending artery; 16: Right posterior-lateral branch; 17: Ramus intermedius; 18: Left posterior-lateral branch. RCA: Right coronary artery; LMCA: Left main coronary artery; LAD: Left anterior descending; LCX: Left circumflex artery.