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Fig. 4D —Findings to be differentiated from S-shaped sinoatrial node artery. S-shaped sinoatrial node artery invariably courses in groove between left atrial appendage and left superior pulmonary vein and is best localized on axial images. 72-year-old man who has undergone coronary artery bypass graft surgery. CT scan shows typical course of saphenous vein graft to obtuse marginal artery. Graft usually courses behind left atrial appendage but with enough distance from groove (white arrow) and should not be mistaken for S-shaped sinoatrial node artery on axial images. S-shaped variant of sinoatrial node artery (black arrows) is evident.