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Figure 5 Computed tomography scan depicting the relationship of the left atrium (LA) to adjacent structures. Note proximity of esophagus to left inferior pulmonary vein in A and to the antrum of the right inferior pulmonary vein (RI) in B. (C) The esophagus (Eso) abuts the coronary sinus (CS). Ao = descending aorta; LI = left inferior pulmonary vein; S = spine.