Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previously reported basilar opacities have rapidly improved , with minimal residual predominantly linear opacities remaining . Remainder of lungs are clear . Apparent small bilateral pleural effusions are noted on the lateral view . Cardiomediastinal contours are stable in appearance allowing for patient rotation .
    OUTPUT:
    
Rapidly improving bibasilar opacities favor either aspiration or atelectasis .