Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Significantly lower lung volumes seen on the current exam with bibasilar left greater than right opacities . Superiorly , the lungs are clear . There is no pneumothorax . The cardiomediastinal silhouette is within normal limits . No displaced fractures identified .
    OUTPUT:
    
Low lung volumes with bibasilar opacities which are likely atelectasis . Infection is not excluded .