Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate normal heart size . Median sternotomy wires are intact . The cardiomediastinal silhouette and hilar contours are normal . The lungs are hyperinflated butclear . Linear scarring is noted in the left lower lung . No pleural effusion or pneumothorax . No displaced rib fracture identified .
    OUTPUT:
    
No evidence of pneumonia or cardiomegaly . Hyperinflated lungs consistent with emphysema .