Primary cardiac angiosarcoma directly invading the right lung: An autopsy report.

We presented a difficult-to-diagnose case of cardiac angiosarcoma. The patient presented pericardial effusion, but cytology of the effusion was negative. Because cytological detection of angiosarcoma cells is difficult, a possibility of malignancy should not be excluded with negative cytological examination. Biopsy of cardiac mass is the best way for diagnosis.