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Fig. 4C —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. 61-year-old man with persistent left superior vena cava. CT
scan shows superior vena cava (arrow) partially filled by collateral
vessels. Cardiac chambers are poorly filled with contrast material.
