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A 42-year-old man was evaluated at our hospital because of paroxysmal atrial fibrillation. Physical examination and ECG during sinus rhythm were unremarkable (no signs of left atrial enlargement).
Further evaluation with transoesophageal echocardiography showed a giant left atrial appendage (figures 1 and and2).2). No left atrial or left atrial appendage (LAA) thrombi were seen, there was no spontaneous echo contrast and LAA flow velocities were normal. No other structural or functional abnormalities were observed. A giant left atrial appendage is not frequently described according to the current literature and is regarded as a congenital heart defect. It has been associated with supraventricular arrhythmias, thromboembolism, cardiac dysfunction, mitral regurgitation and/or compression of the left anterior descending artery.1-3