Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is prominence of the right hilus , stable from ___ . There is no pneumothorax or pleural effusion . Increased retrocardiac opacity , best appreciated on the lateral view is concerning for a focal area of infection .
    OUTPUT:
    
Increased retrocardiac opacity could represent pneumonia in the appropriate clinical setting .