Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Ornamentation projects over the left upper chest . The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . There is a small but confluent opacity projecting over the left lower lung seen on the frontal view , probably within the lingula , concerning for pneumonia . Bony structures are unremarkable .
    OUTPUT:
    
Patchy left lower lung opacity concerning for pneumonia .