Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The tip of the endotracheal tube projects 4 .3 cm from the carina . A feeding tube projects over the gastric body . The tip of a right internal jugular central venous catheter projects over the cavoatrial junction . Several mediastinal drains are noted . Low bilateral lung volumes . A retrocardiac opacity likely reflects postsurgical atelectasis . No pleural effusion or pneumothorax identified . The size the cardiomediastinal silhouette is enlarged but unchanged .
    OUTPUT:
    
Persisting retrocardiac opacity , likely reflecting postsurgical atelectasis . No significant interval change since the prior examination .