Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are stable . The lung volumes are low . In the mid mediastinum there is an air - fluid level which probably refers to dilatation of the esophagus . Streaky atelectasis is noted at the lung bases but no definite pleural effusion . No mediastinal air is demonstrated .
    OUTPUT:
    
Air - fluid in the distal esophagus but no visualization or radiodense foreign body .