Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . The interstitium is mildly prominent , which is most often due to airway inflammation , which would not necessarily be an acute process . No focal opacification is seen .
    OUTPUT:
    
Mild interstitial abnormality , not specific , although often due to airway inflammation .