Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: NG tube terminates in the stomach , although the side port is 2 - 3 cm above the diaphragm . The ET tube terminates 4 .7 cm from the carina . There is dense retrocardiac opacity and silhouetting of the descending thoracic aorta . The lungs are otherwise clear . There is no large pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
1 . Retrocardiac opacity could be due to any combination of atelectasis , infection , or aspiration . Attention on followup suggested . 2 . NG tube terminates in the stomach with side port 2 - 3 cm above the diaphragm . 3 . ET tube terminates 4 .7 cm from the carina .