Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unchanged . Severe emphysematous changes are re- demonstrated . Again demonstrated are increased interstitial opacities within both lung bases as well as within the right upper lung field , not substantially changed in the interval . No pleural effusion or pneumothorax is present . Ossific fragment distal to the left distal clavicle likely is posttraumatic and appears chronic .
    OUTPUT:
    
Re - demonstration of increased interstitial opacities in the right lung and left lung base , findings concerning for infection .