A 50-year-old man was admitted with acute pericarditis.Echocardiography demonstrated a large mass on the right atrial free wall along with a pericardial effusion. Weperformed transvenous biopsy of this mass under transesophageal echocardiographic guidance. Though the biotome obtained the mass, the pathological findings were of organized thrombus. Twoweeks later, a new precordial mass appeared around the left third rib and was suspected to be a metastasis. Incisional biopsy of this mass gave the diagnosis of angiosarcoma.
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