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[Clinical Picture] An unexpected finding in an asymptomatic patient with atrial fibrillation: cardiac angiosarcoma

A 70-year-old asymptomatic man was found to have atrial fibrillation during a routine check-up by his family doctor. He was referred to hospital for further investigation, where transthoracic echocardiography showed a large echogenic intra-atrial mass that almost obliterated the left atrium (figure, videos). Transoesophageal echocardiography showed a space-occupying lesion 9·5 × 7·2 cm arising from the interatrial septum, filling the left atrium, bulging into the right atrium and close to the mitral-aortic continuity.