Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal semi-upright view of the chest was obtained . A new pericardial drain overlies the heart . The cardiac silhouette remains moderately enlarged due to known underlying large pericardial effusion but the apparent left ventricular border is less rounded than on ___ , compatible with a slight interval decrease in pericardial effusion . The azygous vein is also substantially smaller . 7 .6 - cm mass projecting over the right hilum represents the patient 's known large anterior mediastinal mass . The indistinct left costophrenic angle is compatible with a small pleural effusion , which was present on ___ . No pneumothorax .
    OUTPUT:
    
1 . Status post pericardial window with slight interval decrease in pericardial effusion . 2 . Large anterior mediastinal mass and small left pleural effusion , similar to prior .