De novo CD5‐positive primary cardiac diffuse large B‐cell lymphoma diagnosed by pleural fluid cytology

55-year-old woman presenting with progressive shortness of breath, fatigue, mild dizziness, dull chest ache, and lower extremity edema, with a large right atrial mass extending into the right ventricle and associated pericardial and pleural effusions.

Pleural fluid cytology, flow cytometry, and immunohistochemistry

Diagnosis of primary cardiac lymphoma