Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left retrocardiac opacity is new since ___ , concerning for consolidation . Biapical scarring is unchanged . The cardiac and mediastinal contours remain within normal limits . A left - sided pacemaker projects leads into the right atrium and ventricle . There is no pneumothorax .
    OUTPUT:
    
New left retrocardiac opacity concerning for pneumonia .