Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip terminates approximately 7 cm from the carina . An enteric tube tip is within the stomach . Lung volumes are low . Cardiac silhouette size remains moderate to severely enlarged , as seen previously . Widening of the superior mediastinal contour is likely due to a combination of low lung volumes , supine technique , and AP positioning . There is crowding of bronchovascular structures without overt pulmonary edema . Patchy opacities in the lung bases may reflect areas of atelectasis superimposed on a chronic interstitial abnormality . No large pleural effusion or pneumothorax is identified on this supine exam . Moderate degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
1 . Endotracheal and enteric tubes in standard positions . 2 . Low lung volumes . Patchy opacities in the lung bases likely reflect a combination of atelectasis and chronic interstitial abnormality , as seen previously .