Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . An opacity in the left lower lung obscuring the left cardiac border is not well seen on the lateral view but probably represents pneumonia within the lingula . Elsewhere , the lungs appear clear . There no pleural effusions or pneumothorax .
    OUTPUT:
    
Opacity in the left lower lung suggesting pneumonia probably in the lingula .