Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy , aortic valve replacement , and CABG . As before , the superior mediastinal wire remains fractured . Heart size is mild to moderately enlarged , unchanged . Mild interstitial pulmonary edema is decreased in extent compared to the previous study . Minimal blunting of left costophrenic angle suggests a trace pleural effusion . No focal consolidation or pneumothorax is identified .
    OUTPUT:
    
Mild interstitial pulmonary edema , slightly improved from the previous study , with trace left pleural effusion .