Primary cardiac angiosarcoma detected by magnetic resonance imaging but not by computed tomography

A 51-year-old man with a primary angiosarcoma of the right atrium is report ed. The angiosarcoma was not detected by transthoracic echocardiography or computed tomography, but magnetic resonance imaging and transesophageal ech ocardiography did show the tumor of the right atrial free wail. We performe d a transvenous endomyocardial biopsy of the tumor under the guidance of tr ansesophageal echocardiography and made the pathological diagnosis. This ca se demonstrates the advantage of magnetic resonance imaging and transesopha geal echocardiography for tumor detection over transthoracic echocardiograp hy and computed tomography and the usefulness of transesophageal echocardio graphy for guiding the right atrial endomyocardial biopsy procedure.