Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post left VATS . 2 left chest tubes are present . No definitive pneumothorax identified . Persisting retrocardiac opacity which may reflect post procedural changes / atelectasis . Mild atelectasis in the right lower lung zone . No right pleural effusion or pneumothorax . The size of the cardiac silhouette is enlarged but unchanged .
    OUTPUT:
    
No significant interval change since yesterday 's radiograph given slight differences in technique . No discernible pneumothorax identified .