Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Cardiac silhouette size is mild to moderately enlarged . The aorta is mildly tortuous . Lung volumes are slightly low which results in crowding of bronchovascular structures , but no overt pulmonary edema . No focal consolidation , pleural effusion or pneumothorax is seen . There are moderate degenerative changes seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .