Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are stable . The pulmonary vasculature is normal . Lungs are hyperinflated with flattening of the diaphragms and relative lucency within the lung apices compatible with underlying emphysema . No pleural effusion or pneumothorax is identified . On the lateral view , there is a patchy opacity identified in the lower lobe , possibly on the left , which could reflect an area of infection . There are no acute osseous abnormalities .
    OUTPUT:
    
Subtle opacity within the lower lobe on the lateral view , possibly within the left lower lobe . This could reflect an area of developing infection in the correct clinical setting . Emphysema .