Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low leading to crowding of the bronchovascular structures . Bibasilar airspace opacities , right greater than left , likely reflecting patchy atelectasis . There is no pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Low lung volumes and bibasilar airspace opacities which likely reflect atelectasis , although superimposed infection can not be entirely excluded .