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Figure 2 M-mode (left) and two-dimensional (right) transesophageal echocardiography longitudinal image in the midupper esophagus. The M-mode demonstrates marked interatrial septum (IAS) mobility, with an excursion >15 mm. By definition this is an atrial septem aneurysm. LA = left atrium; RA = right atrium; SVC = superior vena cava.