Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A nasogastric tube terminates in the stomach . The heart is normal in size . The mediastinal and hilar contours appear unchanged . Blunting of each costophrenic sulcus suggests likely small pleural effusions . A persistent retrocardiac opacity is similar to the prior study and could be seen with atelectasis . An infectious etiology can not be excluded , however . No free air is demonstrated .
    OUTPUT:
    
Satisfactory positioning of nasogastric tube . Persistent retrocardiac opacity suggestive of atelectasis and suspected very small pleural effusions .