Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . There has been slight interval improvement in the moderate right pleural effusion , with adjacent atelectasis . The mediastinal contours are normal . The left lung is clear . There is no pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Slight interval improvement in the moderate right pleural effusion compared to the prior exam . Left lung is clear .