Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung is clear . There has been improvement in the left lower lobe collapse with only a small amount of atelectasis remaining . There is a small left pleural effusion . The heart size is top - normal . No large pneumothorax is appreciated . Coils and drainage catheters project over the left upper quadrant . Unchanged elevation of the left hemidiaphragm .
    OUTPUT:
    
Small left pleural effusion . Significant interval improvement in left lower lobe collapse with mild atelectasis remaining .