Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are within normal limits for technique . Bibasilar atelectasis has improved , particularly in the left lung base with only linear atelectasis remaining . Partial atelectasis of the right lower lobe has also improved with better visualization of the right hemidiaphragm . Apparent small pleural effusions are not appreciably changed .
    OUTPUT:
    
Improving bibasilar atelectasis .