[Successful Surgical Treatment of Primary Cardiac Lymphoma Detected with the Onset of Acute Heart Failure;Report of a Case].

A 83-year-old woman, suffering from rapidly worsening dyspnea and weight gain from a week ago, was referred for evaluation and treatment of cardiac tumor in the right atrium. Echocardiography and enhanced computed tomography revealed a large tumor, more than 6 cm, occupying the right atrium and blocking the tricuspid valve inflow. Electrocardiogram showed bradycardiac atrial fibrillation. We performed partial resection with cardiopulmonary bypass, in order to improve hemodynamics and to make a definite diagnosis. In operation, the tumor infiltrated not only the right atrium but also the right ventricle and the tricuspid annulus. The pathological examination suggested malignant lymphoma, diffuse large B-cell type. The patient was treated chemotherapy postoperatively. She is alive 1 year after the surgery without apparent recurrence.