Chest CT showed a moderate right pleural effusion and moderate-to-large pericardial effusion (see fig. 1 ). Transthoracic echocardiography showed a moderate pericardial effusion with mild hemodynamic compromise (see fig. 2 ). Cardiac MRI revealed a moderate-tolarge circumferential, simple-appearing pericardial effusion with features of hemodynamic compromise (dilated inferior vena cava and biatrial/right ventricular partial collapse) and small left and moderate right-sided pleural effusions. A

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... ericardial window was performed and fluid analysis revealed 889,888 red blood cells/mm 3 and 6,235 total nucleated cells/mm 3 with lymphocytic predominance. What is your diagnosis?