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Left Atrial Pseudomass by Transthoracic Echocardiography

An 87-year-old man presented with cardiac amyloidosis and congestive heart failure. His four-chamber view showing the left ventricle (LV), left atrium (LA), right ventricle (RV), and right atrium (RA) from TTE is given in Figure 1 and has the appearance of a left atrial mass. An anteriorly angulated view is shown in Figure 2; it can be seen that this mass is attached by a thin pedicle and is positioned in the area of the normal tissue ridge that separates the left atrial appendage (LAA) from the pulmonary vein (PV). In real-time, the LAA showed active contraction.