Lymphoma patients are at high risk of cardiovascular events due to anthracycline cardiotoxicity and, in rare cases, related to heart infiltration. The presence of cardiac masses adds further complexity to the management of lymphoma patients beyond myocardial chemotherapy-related toxicity, given possible unpredictable acute complications such as arrhythmias, atrioventricular block, myocardial ischemia, pericardial effusion and cardiac tamponade. Here we describe the clinical presentation and successful multidisciplinary management of diffuse large B-cell lymphoma with multifocal cardiac involvement identified by total body 18FDG positron emission tomography performed at disease staging.