Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . The mediastinal contours are unremarkable . There is crowding of the bronchovascular structures but no overt pulmonary edema is seen . Streaky opacities in the lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are multilevel degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes , mild bibasilar atelectasis .