Abstract Primary cardiac lymphoma (PCL) is a rare and highly lethal neoplasm, whose nonspecific clinical presentation makes early diagnosis difficult. This article reports the case of an elderly patient, previously healthy, who experienced dizziness and syncope for four months before the discovery of a large tumor mass in the heart. Imaging exams, such as echocardiography and magnetic resonance imaging, were crucial for tumor identification, and the biopsy confirmed it to be a B-cell lymphoma with high replication. However, given the […]