Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographdemonstrates well expanded lungs . No CHF , focal infiltrate , pleural effusion or pneumothorax detected . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
Normal chest radiograph . No pneumothorax or pneumomediastinum .