Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A nasogastric tube terminates within the stomach . Since the ___ examination there has been improved aeration at the lung bases . No new superimposed consolidation or opacity is seen . There is a persistent small left pleural effusion . The heart size is normal . The hilar and mediastinal contours are within normal limits . There is no pneumothorax .
    OUTPUT:
    
No new consolidation or opacity since ___ . Improved bibasilar aeration .