Fig. 1. (A) Non-contrast CT (calcium score scan) showing no calcification in the right coronary artery (arrow). (B) First-phase contrast-enhanced CT showing.

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Fig. 1. (A) Non-contrast CT (calcium score scan) showing no calcification in the right coronary artery (arrow). (B) First-phase contrast-enhanced CT showing enhancement of coronary lumen (arrowhead) with no significant plaque enhancement (arrow). Coexistence of an atrial septal aneurysm is seen (asterisk). (C) Second-phase contrast-enhanced CT showing clear enhancement of coronary lumen (arrowhead) and plaque (arrow) (the napkin-ring sign). Coexistence of an atrial septal aneurysm is seen (asterisk). (D) The automated plaque quantification tool revealed the low attenuation component (<40 HU) (asterisk). On the color map image (right), red, blue, and yellow shows <40 HU, 40- to 120 HU, and >120 HU, respectively. Fig. 1. (A) Non-contrast CT (calcium score scan) showing no calcification in the right coronary artery (arrow). (B) First-phase contrast-enhanced CT showing enhancement of coronary lumen (arrowhead) with no significant plaque enhancement (arrow). Coexistence of an atrial septal aneurysm is seen (asterisk). (C) Second-phase contrast-enhanced CT showing… Cardiovasc Imaging Asia. 2017 Jul;1(3):205-207. https://doi.org/10.22468/cvia.2017.00010