Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Moderate enlargement of the cardiac silhouette is unchanged . The mediastinal and hilar contours are grossly similar . There is crowding of bronchovascular structures without overt pulmonary edema . Patchy opacities in the lung bases are similar compared to the prior study , likely reflective of atelectasis . No large pleural effusion or pneumothorax is identified . Hypertrophic changes are again seen in the thoracic spine .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis , not substantially changed from prior .