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 are noted , left greater than right , which may reflect atelectasis , aspiration or pneumonia . Clinical correlation is recommended . There is no large pleural effusion or pneumothorax identified . The cardiac size is difficult to assess secondary to the patient 's low lung volumes . Calcifications are seen at the aortic arch . Incidental note is made of an azygos lobe .
    OUTPUT:
    
1 . Low lung volumes and bibasilar airspace opacities , left greater than right , likely representing atelectasis , although pneumonia and aspiration should also be considered .