Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiograph of the chest demonstrates interval worsening of a left mid lung opacification which could represent pneumonia in the appropriate clinical setting , however , this could also be seen with asymmetric pulmonary edema . There are persistent bilateral interstitial opacities consistent with pulmonary fibrosis . There is no interval change in heart size . No pneumothorax is seen .
    OUTPUT:
    
Left mid lung opacity could represent pneumonia in the appropriate clinical setting ; however , asymmetric pulmonary edema can also have this appearance . Persistent interstitial opacities consistent with pulmonary fibrosis .