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Fig. 4A —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. 65-year-old man with a history of coronary artery disease and chest pain. CT scan shows independent small atrial branch arising from left circumflex artery (not shown) and coursing in groove between left atrial appendage and left superior pulmonary vein and behind left atrium (white arrows) but not reaching sinoatrial node area. True sinoatrial node artery is left-sided artery arising from left circumflex artery (black arrows).