Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A linear right upper lung opacity is re - demonstrated , overall similar in appearance to ___ . The lungs are hyperinflated but clear . The cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Persistent linear right upper lung opacity is demonstrated and similar in appearance to multiple prior examinations . Hyperinflated lungs suggest emphysema . No focal consolidation or effusion . Consider nonurgent , chest CT for further evaluation of right upper lung opacity when clinically appropriate .