Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Nasogastric tube seen to the level of distal stomach , tip not included on the last radiograph . Shallow inspiration . Sternotomy . Small left pleural effusion , stable . Improved left basilar infiltrate or atelectasis since prior exam . Right lung clear .
    OUTPUT:
    
Small left pleural effusion . Improved left basilar infiltrate or atelectasis