Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lung volumes are low with mild streaky opacities in the lung bases likely reflective of atelectasis . No focal consolidation is seen . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities including no displaced rib fractures .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis . No displaced rib fractures are seen .