We presented a case of symptomatic secondary cardiac B-cell lymphoma localised in the free wall of the right ventricle (RV). It was detected during transthoracic echocardiography and confirmed by nuclear magnetic resonance imaging. The RV free wall motion abnormalities, decreased dimensions of RV and small pericardial effusion were found. The tumour dimensions declined after the first cycle of chemiotherapy with antracyclins.We presented a case of symptomatic secondary cardiac B-cell lymphoma localised in the free wall of the right ventricle (RV). It was detected during transthoracic echocardiography and confirmed by nuclear magnetic resonance imaging. The RV free wall motion abnormalities, decreased dimensions of RV and small pericardial effusion were found. The tumour dimensions declined after the first cycle of chemiotherapy with antracyclins
