Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated , consistent with known emphysema . There is a linear area of opacity in the lung and left lung base , which likely represents scarring given that it was present in ___ . A component of atelectasis in the left lung base may also be present . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable . The aorta is noted to be tortuous .
    OUTPUT:
    
1 . Atelectasis in left lung base . 2 . Emphysema .