Fig 2. a. Cardiac anatomic specimen from a modified left lateral view in which an oblique vertical transection passing through the SVC posteriorly and the RV anteriorly has been performed to show the lateral half of the SVC-RA junction. In this image, the CT becomes the AR (white dotted line) at the anterosuperior SVC-RA junction. b. Cardiac anatomic specimen from an anteroinferior modified view in which the anterior RA and RAA have been removed to show the CT becoming the AR (white dotted line). In this image, the tip of an ICE tilted posteriorly is represented as a white circle from which clock and counterclockwise rotation is performed to obtain a long view of the SVC-RA junction to visualize the lateral, medial, and septal aspects of the AR (represented as white transparent beams). c. Cardiac anatomic specimen from a right lateral modified view in which part of the SVC and the lateral half of the posterior RA wall have been removed to show the septal extension of the AR (dotted white line) approaching the interatrial septum next to the Ao. d . Long axis ICE view of the SVC-RA junction showing the AR at its lateral portion. e . Long axis ICE view of the SVC-RA junction showing the AR at its septal portion (black dotted line) in which a small portion of the Ao is viewed. RA: right atrium, LA: left atrium, AR: arcuate ridge, SVC: Superior Vena Cava, IVC: Inferior Vena Cava, RAA: right atrial appendage, RSPV and RIPV: right superior and inferior pulmonary veins, FO: Foramen ovale, TV: Tricuspid valve, RV: right ventricle, AO: aorta, CT: crista terminalis. Reproduced from: Shivkumar K, Editor Shumpei Mori Kalyanam Shivkumar S. Anatomical basis of cardiac interventions, volume 1 cardiac anatomy. Vol. 1. 2022. 87–96 p.; McAlpine WA. Heart and Coronary Arteries. Vol. 1, Heart, and Coronary Arteries. Springer Berlin Heidelberg; 1975. 97–99 p.