Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is stable . Mild pulmonary edema is slightly improved from ___ . Postoperative mediastinum and left ICD are unchanged . No pneumothorax or substantial pleural effusion . Persistent elevation of the left hemidiaphragm is unchanged .
    OUTPUT:
    
Mild pulmonary edema is slightly improved from ___ .