Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is enlarged . There is a new retrocardiac opacity with increased opacity also projecting projecting over the left lower lobe , seen best on the lateral view , concerning for lower lobe pneumonia . There is a probable overlying small left - sided pleural effusion . There is no pneumothorax .
    OUTPUT:
    
New increased retrocardiac opacity , concerning for left lower lobe pneumonia with a probable overlying small left - sided pleural effusion .