Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is stable hyperinflation , consistent with emphysema . Since the prior exam , there is a worsening interstitial abnormality , which may reflect either mild edema superimposed on a background of emphysema or a progressive intersitial lung disease , such as fibrosis . There are no focal airspace opacities to suggest pneumonia . There is no pleural effusion or pneumothorax . The mediastinal contours are normal . The heart size is mildly enlarged , very slightly increased from ___ .
    OUTPUT:
    
1 . Diffuse interstitial abnormality , worsened since ___ , which may reflect new edema superimposed upon a background of emphysema or a progressive interstitial lung disease such as fibrosis . 2 . Mild cardiomegaly .