Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The large left pleural effusion is decreased as evidenced by significantly better visualization of the left hemidiaphragm which was previously silhouetted by the pleural effusion . Significant opacification of the left chest is still present and likely represents a combination of remaining moderate - to - large pleural effusion and atelectasis . The right lung appears well expanded and clear . No pneumothorax is present .
    OUTPUT:
    
Left pleural effusion is decreased following thoracentesis and is now medium in size .