Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates unchanged cardiomegaly . There is mild pulmonary edema . Retrocardiac opacity is likely due to edema and superimposed atelectasis . No pleural effusion or pneumothorax is identified .
    OUTPUT:
    
1 . Mild pulmonary edema . 2 . Unchanged cardiomegaly .