Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly persists . The mediastinal and hilar contours are unchanged . There is mild pulmonary edema , slightly worse compared to the previous exam . No pleural effusion or pneumothorax is seen , and no acute osseous abnormalities are demonstrated .
    OUTPUT:
    
Mild pulmonary edema , slightly worse compared to the previous exam .