Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation of the radiograph is limited due to poor photon penetration . Within these limitations , the lungs are low in volume and show subtle retrocardiac lower lobe opacity . The cardiac silhouette is enlarged . The mediastinal silhouette and hilar contours are normal . An ET tube terminates at the carina and should be withdrawn by at least 3 cm for optimal position . An NG tube passes out of view below the diaphragm .
    OUTPUT:
    
Subtle retrocardiac opacity could represent sequalae of aspiration or atelectasis . Low lying endotracheal tube terminates at the carina should be withdrawn by 3 cm for optimal position . These findings were communicated to ___ MD via telephone at 11 :02 pm on ___ .