Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Right lung is clear . Subtle opacity in the left lower lung could represent a very early pneumonia in the correct clinical setting . No large effusion or pneumothorax . The heart appears top - normal in size . Mediastinal contours unremarkable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Possible left lower lobe pneumonia .