Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no significant change compared with prior examination . The lungs are hyperinflated with some flattening of both diaphragms . Bilateral interstitial markings , more prominent at the lung bases , are compatible with fibrosis . No new focal parenchymal opacity is seen . Prominent atherosclerotic calcifications of the aortic knob are present . Cardiomediastinal and hilar contours are unremarkable . There is no cardiomegaly . No pleural effusion or pneumothorax . Biapical pleural parenchymal scarring is present and unchanged .
    OUTPUT:
    
No new focal parenchymal opacity to suggest pneumonia . Bibasilar prominent interstitial markings as well as biapical scarring are unchanged since at least ___ .