Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The compared to ___ , there is evidence of mild progression of known interstitial lung disease with increased interstitial markings , especially at the bases . The lungs are hyperexpanded , though unchanged . Biapical thickening is unchanged . No pleural effusion or focal consolidation is seen . The heart size is unchanged . The mediastinum and hilar contours are unchanged from prior . Aortic knob calcification is unchanged .
    OUTPUT:
    
1 . Evidence of mild progression of known interstitial lung disease . 2 . While unable to assess resolution of prior pneumonia , there is no evidence of focal pneumonia on this exam .