Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes limit assessment of the lung bases . The heart size is top normal . The mediastinal and hilar contours are unremarkable . There is crowding of the bronchovascular structures but no overt pulmonary edema is present . Streaky opacities in the lung bases may reflect atelectasis but infection can not be excluded . No pleural effusion or pneumothorax is seen . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Low lung volumes limit assessment of the lung bases . Bibasilar airspace opacities could reflect atelectasis but infection can not be excluded . Consider repeat PA and lateral views with improved inspiratory effort when the patient is able .