Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates well expanded and clear lungs . No pleural effusion or pneumothorax . Heart size , mediastinal contour are , and hila are unremarkable . No free air under the diaphragm .
    OUTPUT:
    
1 . Normal chest radiograph . 2 . No evidence of free intraperitoneal air .