Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Extensive bilateral opacities are unchanged from the prior examination and likely reflect the patient underlying severe interstitial lung disease . There is possibly increased opacification of the right lower lung , which may represent mild edema . Hilar and cardiomediastinal contours are unchanged . Calcification of the aortic arch is noted . There is no pneumothorax . There is no pleural effusion .
    OUTPUT:
    
Minimally increased opacification of the right lower lung may reflect mild edema superimposed on chronic severe interstitial lung disease .