Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged , as before . The aortic arch is calcified . The mediastinal and hilar contours appear unchanged . There is a similar mild interstitial abnormality and an irregular appearance of interstitial markings in the upper lungs suggestive of emphysema . There is no pleural effusion or pneumothorax . Patchy opacities in the lingula and left lower lobe suggest minor atelectasis , unchanged . The bones are probably demineralized . Minimal degenerative changes are present along the thoracic spine .
    OUTPUT:
    
Mild interstitial abnormality probably reflecting airway disease and emphysema with no definite acute process .