Congestive Heart Failure and Complete Heart Block with Primary Lymphoma of the Heart

Primary lymphoma of the heart is an extremely rare condition which is usually diagnosed postmortem. We report the case of a 26-year-old man who presented with congestive heart failure and complete heart block. Transthoracic echocardiography demonstrated right atrial mass and increased interventricular and posterior wall thickness. Transesophageal echocardiography and magnetic resonance imaging confirmed the right atrial mass and increased wall thickness. Operative myocardial biopsy revealed high-grade giant cell malignant lmyphoma. S ince further diagnostic studies failed to demonstrate extracardiac lymphoma involvement, diagnosis of primary lymphoma of the heart was considered.