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Fig. 4B —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. 56-year-old woman with recanalized ligament of Marshall. CT scan shows ligament of Marshall (arrow) is recanalized because left brachiocephalic vein is occluded (not shown).