Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well aerated and hyperinflated . Mild flattening of the diaphragmatic surfaces bilaterally . Heart size , mediastinal contours and hila are unremarkable . Pleural surfaces are normal without pneumothorax . No focal opacity suggestive of pneumonia . Visualized bones are unremarkable .
    OUTPUT:
    
Hyperinflated lungs . No evidence of pneumonia .