Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . Lungs are well expanded . There is no pleural effusion , large focal consolidation or pneumothorax . There is redemonstration of bilateral linear opacities not significantly changed since at least ___ , likely due to scarring .
    OUTPUT:
    
No evidence of pneumonia .