Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , there has been reduction in lung volumes with bibasilar opacities likely representing atelectasis . The cardiomediastinal contours are normal . No pleural effusion or pneumothorax . No large consolidation is seen .
    OUTPUT:
    
Low lung volumes and bibasilar atelectasis , but no pneumonia or pleural effusion .