Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vascularity is normal . Streaky bibasilar airspace opacities likely reflect atelectasis . No pleural effusion or pneumothorax is seen . Multiple old right - sided rib fractures are re - visualized .
    OUTPUT:
    
Bibasilar airspace opacities likely reflect atelectasis .