Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs demonstrate mild interstitial abnormality , best seen on the lateral view . There is no focal consolidation , pleural effusion or pneumothorax . The heart size is normal . The mediastinal contours are unremarkable . The pulmonary vasculature appears normal .
    OUTPUT:
    
Mild interstitial abnormality , which in a young patient may be seen in asthma or history of heavy smoking .