Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are better expanded compared to the previous study . In particular , left base is better aerated . There is a significant decrease in bilateral pleural effusions . Heart is top normal in size , and anterior mediastinal mass appears to have decreased in size . No pneumothorax .
    OUTPUT:
    
1 . Interval resolution of right pleural effusion and decreasd size of left - sided pleural effusion . 2 . Decrease in size of the anterior mediastinal mass .