Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is unchanged . Lungs are hyperinflated , as before . The central pulmonary arteries remain prominent . A linear opacity at the right base is unchanged and likely represents scarring . There is no consolidation or pleural effusion . No pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .