De novo CD5-positive primary cardiac diffuse large B-cell lymphoma coexpressing C-myc and BCL2 in an immunocompetent adult

A 64-year-old female presented with a 4-month history of facial puffiness, exertional chest tightness, and dyspnoea, with engorged jugular veins, absent lower limb oedema and no lymphaedenopathy. Computed tomography revealed a 66 × 57 mm mass in the right atrium, extending into the superior and inferior vena cava, as well …