Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previous opacity at the right base is significantly improved . There is minimal bibasilar atelectasis . Faint opacities in the right mid lung similar to prior are likely reflect sequela of prior pneumonia . Heart size is top - normal as before . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . There are degenerative changes in the right AC and partially imaged left AC joints .
    OUTPUT:
    
No new focal airspace opacity to suggest pneumonia . Bibasilar atelectasis .