Abstract
An elderly man was found to have a large right atrioventricular mass and pericardial effusion. He was diagnosed and treated as having primary cardiac lymphoma. A dose-attenuated chemotherapy regimen of rituximab, cyclophosphamide, vincristine, and prednisolone, with a cytoreductive pre-phase, afforded complete regression of disease with resolution of the patient's symptoms, and without deterioration in cardiac function or immunosuppression. The patient remains well 12 months after presentation. (Level of Difficulty: Advanced.).