[Malignant lymphoma of the heart]

A case of malignant lymphoma in the heart is presented. A 75-year-old man was admitted to hospital for dyspnea. Echocardiography revealed a right atrial tumour and enlargement of the right ventricular wall. Myxoma was suspected clinically. The patient died from rapidly progressing congestive heart failure. Autopsy revealed massive infiltration of the myocardium in the right atrium, right ventricle and the tricuspid valves by a high grade malignant non-Hodgkin lymphoma of B-cell type. Malignant lymphoma was found at no other sites except for a five mm tumour in the thyroid gland and a larger six by five by four cm mediastinal tumour.