Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged , and the pulmonary vascularity is not engorged . Minimal interstitial opacities in lung bases may reflect chronic interstitial abnormality , as noted on the prior chest CT . No focal consolidation , pleural effusion or pneumothorax is visualized . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Chronic interstitial lung abnormality at the lung bases persists , as better seen on prior CT .