Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear but mildly hyperinflated with flattened diaphrams consistent with airtrapping due to emphysema or small airway obstruction . There is no evidence of pneumonia . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal .
    OUTPUT:
    
Possible emphysema or small airway obstruction . No pneumonia or focal lung lesion .