Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . There is mild pulmonary edema . A linear retrocardiac opacity is most likely atelectasis . No focal opacity is identified to suggest pneumonia . There is no pleural effusion or pneumothorax . The mediastinal contour is normal .
    OUTPUT:
    
Mild pulmonary edema and retrocardiac atelectasis .