Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Apparent enlarged heart is likely secondary to prominent epicardial fat . . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Low lung volumes . Bibasilar atelectasis . No pleural effusion or pneumothorax is seen . Known left - sided rib fractures are better visualized on same - day CT .
    OUTPUT:
    
Bibasilar atelectasis . No pneumothorax , as clinically questioned .