Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal , and hilar contours are normal . The pulmonary vascularity is normal . The lungs are clear . No pleural effusion or pneumothorax is identified . No pneumomediastinum is detected . There are no acute osseous abnormalities . There is no free air under the diaphragms .
    OUTPUT:
    
Normal chest radiograph .