Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are normal . The lungs are clear . There is no pleural effusion or pneumothorax . Osseous structures are unremarkable .
    OUTPUT:
    
1 . No evidence of hilar or mediastinal lymphadenopathy . 2 . The lungs are clear .