Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: CT chest tubes project over the left hemithorax . There is a retrocardiac opacity noted likely a combination of atelectasis and pleural fluid . Mild atelectasis in the right lower lung zone . No discernible pneumothorax identified . The size of the cardiac silhouette is enlarged but overall unchanged .
    OUTPUT:
    
Interval placement of a second left chest tube . No discernible pneumothorax is identified . Persisting retrocardiac opacity likely reflects a combination of atelectasis and a pleural effusion .