Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal and hilar contours are stable . Emphysema is particularly severe in the right upper lobe . Persistent opacity at the base of the right lobe medially is a region of chronic , unexplained atelectasis . There is also a region of relative increased ___ in the right midlung , which should be evaluated with at least a lateral view to determine if there is a subtle pneumonia or an artifact of overlying soft tissue . No pleural effusion or pneumothorax .
    OUTPUT:
    
Possible pneumonia , right midlung . Lateral view recommended . Chronic right lower lobe atelectasis . Probable emphysema .