Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal , with a left ventricular configuration . The aorta is mildly tortuous , otherwise the hilar and mediastinal contours are normal . There is mild bibasilar atelectasis . There is no large pleural effusion or pneumothorax . No definite rib fractures are identified .
    OUTPUT:
    
No definite rib fractures are identified . No evidence of pneumothorax .