Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are better aerated with mild pulmonary edema substantially improved from ___ . Postoperative mediastinal contours and mild cardiomegaly are stable . No substantial pleural effusion . No pneumonia . Semiopaque density adjacent to the right hemidiaphragm is seen to represent subdiaphragmatic fat on previous CT of the abdomen and pelvis .
    OUTPUT:
    
Mild pulmonary edema substantially improved from ___ . No evidence of pneumonia .