Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Persistent though substantially decreased left pleural effusion is moderate in size . Opacities projecting over the now visible left mid lung and right lower lung likely reflect residual atelectasis . Visible cardiomediastinal and right hilar contours are unchanged . Stable healed right rib fracture .
    OUTPUT:
    
Substantial interval decrease in left pleural effusion , now moderate in size . Opacifications projecting over left mid lung and medial aspect of the right lower lung likely reflect atelectasis .