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Figure 10


Fig. 4A —Sinoatrial node branch variations. Ao = aortic root, D1 = first diagonal, GCV = great cardiac vein, LA = left atrium, LAD = left anterior descending artery, LCx = left circumflex artery, LM = left main coronary artery, OM1 = first obtuse marginal, RCA = right coronary artery, RVOT = right ventricular outflow tract, SVC = superior vena cava. Axial 10-mm maximum-intensity-projection (MIP) image in 64-year-old man shows large sinoatrial node branch (arrow) as it arises from proximal right coronary artery. It then courses posteriorly toward cephalad aspect of interatrial septum (arrowheads) posterior to inflow of superior vena cava.