Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Heart size remains mild to moderately enlarged . The aorta is tortuous and calcified . Mild pulmonary edema is slightly improved from the previous study . No focal consolidation , pleural effusion or pneumothorax is identified . Subsegmental atelectasis is demonstrated within the right lung base . There are mild degenerative changes in the thoracic spine . Multiple clips are seen within the right upper quadrant of the abdomen .
    OUTPUT:
    
Mild pulmonary edema , slightly improved from the previous study .