Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are fully expanded . Subtle left lower lung opacity . No pleural abnormality . Heart size is normal . Cardiomediastinal and hilar silhouettes are unremarkable . Incidental note made of radiodense device and wires projecting over the upper abdomen .
    OUTPUT:
    
Subtle left lower lung opacity could represent focal pneumonia .