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A 50-year-old woman presented with four weeks of palpitations on lying down. She had no chest pain, shortness of breath, weakness, or neurological symptoms. On examination she was in regular sinus rhythm with normal S1 and S2 sounds and no gallops, rubs or murmurs. Trans-esophageal echo (TEE) study showed a 3.8cm mobile left atrial lesion attached to the superior portion of the atrial septum. Cardiac catheterization showed mild, non-obstructive coronary artery disease. Left ventricular ejection fraction was 60%.