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 . Apart from minimal bibasilar atelectasis , the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is visualized . Multiple old bilateral rib fractures are re - demonstrated .
    OUTPUT:
    
No acute cardiopulmonary abnormality .