Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Mediastinal and hilar contours are unremarkable . Crowding of the bronchovascular structures is demonstrated without overt pulmonary edema . Minimal streaky opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is seen . Moderate multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .