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Interatrial Conduction Delay and Atrioventricular Block Due to Primary Cardiac Lymphoma

A 70-year-old woman with signs of acute heart failure was referred to our emergency department. She had no cardiac history. The ECG on admission (Fig. 1, left panel) demonstrated interatrial conduction delay with a broad biphasic Pwave (200 ms) and a third degree AV block. Transesophageal echocardiography revealed massive thickening of the interatrial septum (maximum 21 mm). Additional cardiac magnetic resonance imaging revealed an extensive tumorous mass in-