Abstract
INTRODUCTION: Cardiac involvement as an initial presentation of malignant lymphoma has been a rare occurrence. CASE PRESENTATION: We have reported a 78 year old man with complaint of abdominal pain and vomiting. In patients preoperative evaluation for surgical management of an intra-abdominal mass, a large intracardiac mass has found incidentally during the echocardiography. Pathologic biopsy of right atrial mass that has removed by open heart surgery shown: non Hodgkin-B cell lymphoma. Bone marrow biopsy was taken and was positive for lymphomatous involvement. CONCLUSIONS: The patient has treated by CHOP chemotherapy regiment successfully and after completion of treatment, there was complete response.