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 . Lungs are clear . No pleural effusion or pneumothorax is seen . Minimal subtle cortical abnormality is seen along the inferior aspect of the left posterolateral ninth rib which could reflect a nondisplaced fracture .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Possible nondisplaced fracture of the left posterolateral ninth rib . Further assessment can be obtained with a dedicated rib series if needed .