Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged . There is a streaky opacity in the right mid lung which has coalesced , suggesting scarring or atelectasis , but overall aeration of the lungs has improved , including resolution of a band - like opacity in the left lower lung . There is persistent mild - to - moderate elevation of the right hemidiaphragm with a drain projecting over the right upper quadrant of the abdomen . There is no pleural effusion or pneumothorax . No free air is seen . Bony structures are unremarkable .
    OUTPUT:
    
Improving basilar opacity suggesting atelectasis or scarring .