Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged but unchanged . The mediastinal and hilar contours are stable . The pulmonary vascularity is not engorged . Interstitial opacities within the lung bases are compatible with chronic fibrotic changes . No focal consolidation , pleural effusion or pneumothorax is visualized . Dextroscoliosis of the thoracic spine is again noted .
    OUTPUT:
    
Chronic interstitial abnormality most pronounced at the lung bases . No acute cardiopulmonary abnormality otherwise seen .