Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Extremely low lung volumes are noted with secondary crowding of the bronchovascular markings . Bibasilar , left greater than right opacities may be due to atelectasis . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Extremely low lung volumes . Left basilar opacity may be secondary to atelectasis , infection would be hard to exclude .