Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours normal . The lungs are hyperinflated but clear . Severe emphysema is present There is no pneumothorax or pleural effusion . There are multiple rib deformities in the left upper hemithorax , as seen on prior chest radiograph . The thoracic aorta is mildly tortuous .
    OUTPUT:
    
Hyperinflated lungs , but no evidence of pneumonia .