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Massive Metastatic Intracardiac Lymphoma Presenting with Complete Heart Block with Resolution Following Chemotherapy

A 64-year-old female with a past history significant for follicular small cell cleaved lymphoma presented with acute onset of nausea, diaphoresis, and dizziness, which awoke her from sleep. Electrocardiogram (ECG) revealed complete heart block with a ventricular rate of 25 beats/min and a permanent dual chamber pacemaker was implanted (Fig. 1). One week later, she came for routine pacemaker follow-up. ECG now revealed ventricular tachycardia at a rate of 100 beats/min. The patient was asymp-