[A case of primary angiosarcoma of the heart].

We report a case of angiosarcoma of the right atrium, manifested as a cardiac tamponade. The patient was a 57-year-old man. Transesophageal echocardiographic examination revealed a pericardial effusion and an abnormal structure arising in the right atrium. Emergency operation was performed and the tumor in the right atrium was resected under cardiopulmonary bypass. The resected tumor measured 5.0 x 3.5 x 2.0 cm, and microscopic examination revealed an angiosarcoma. The patient was initially recovered, but he died of heart failure caused by the recurrence in the left ventricle on the 5th postoperative month.