Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chronic mild hyperinflation of lungs without flattening of diaphragms . Lungs are clear , and pleural surfaces are normal . Heart size , mediastinal and hilar contours are normal without lymphadenopathy .
    OUTPUT:
    
Stable chronic mild hyperinflation of lungs without radiographic evidence of pneumonia or lung mass .