Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , which results in bronchovascular crowding and exaggeration of the cardiac silhouette . Bibasilar opacities may reflect atelectasis , however aspiration or superimposed infection can not be excluded . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Bibasilar opacities may represent atelectasis , however aspiration or superimposed infection can not be excluded .