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Fig. 4B —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
MIP image shows sinoatrial node branch (arrow) in 65-year-old woman
as it arises from proximal left circumflex artery: Sinoatrial branch still
courses toward cephalad aspect of interatrial septum.
