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. 2021 May 31;8:649855. doi: 10.3389/fcvm.2021.649855

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Copyright © 2021 Thiene, Frescura, Padalino, Basso and Rizzo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(a) The right coronary artery orifice (arrow) is just above (2 mm) the sinotubular junction, within normal limits. (b) The right coronary orifice (arrow) is well above the sinotubular junction (10 mm), over the threshold of normal limits.