Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a faint opacity in the left lower lobe , suspicious for pneumonia . No pleural effusion or pneumothorax . Heart is top - normal in size . Mediastinal and hilar contours are unremarkable . No subdiaphragmatic free air .
    OUTPUT:
    
Left lower lobe opacity , suspicious for pneumonia .