Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET and NG tubes are in standard , unchanged positions . The cardiomediastinal and hilar contours are unchanged . There is no pneumothorax or large pleural effusion . Lung volumes remain low , and there is a new right basilar opacity which may represent atelectasis , aspiration , or pneumonia . There is no evidence for pneumonia or edema in the upper lungs .
    OUTPUT:
    
New right basal atelectasis , aspiration , or pneumonia .