Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The heart remains mildly enlarge . The aorta is tortuous and demonstrates calcifications along the aortic arch . The mediastinal and hilar contours are relatively unchanged . Previous pattern of interstitial pulmonary edema has improved . Hyperinflation of lungs with flattening of the diaphragms suggests COPD . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Interval improvement of interstitial pulmonary edema . No definite evidence for pneumonia .