FIGURE 2.  (A) Axial image showing left main coronary ostium and its divisions into left anterior descending, ramus intermedius, and left circumflex arteries. (B) Multiplanar reconstructed image. (C) Anatomic 3-dimensional volume-rendered image showing relationships among left main artery, branches, and adjacent cardiac structures. (D) Curved multiplanar reconstruction of entire length of left circumflex artery. A = aorta; CX = left circumflex coronary artery; LA = left atrium; LAD = left anterior descending coronary artery; LM = left main artery.