Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Cardiac silhouette size is top normal . The mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Increased interstitial opacities are noted in lung bases bilaterally , similar to that seen on the previous chest radiograph , and appear to correlate to a chronic interstitial abnormality better assessed on the previous CT . No new focal consolidation , pleural effusion or pneumothorax is present . There are not arm moderate degenerative changes in the mid thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Chronic interstitial abnormality at the lung bases , better assessed on the previous chest CT .