Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . Bibasilar atelectasis is present ; however , there are no focal opacities that are concerning for pneumonia . Cardiac size is normal . There is no pleural effusion , pulmonary edema or pneumothorax .
    OUTPUT:
    
Bibasilar atelectasis without evidence of pneumonia .