Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . Again seen are postsurgical changes throughout the lower right lung . Linear bibasilar opacities are most compatible atelectasis . A right basilar opacity seen on the ___ examination appears improved .
    OUTPUT:
    
Persistent right basilar opacity appears slightly improved since ___ .