Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes appear normal . Median sternotomy wires are well aligned . The cardiomediastinal silhouette and hilar contours appear normal . Linear opacities at the bases are not appreciably changed since ___ and likely represents scarring . There are no focal opacities to suggest pneumonia . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild bibasilar scarring ; however , no focal opacities to suggest pneumonia . The above results were communicated via telephone by Dr . ___ to ___ ___ at 11 :57 p .m . on ___ as requested .