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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.
