Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest ___ at 15 :41 are submitted .
    OUTPUT:
    
Interval resolution of mild to moderate pulmonary edema . The air - filled structure in the right retrocardiac region has decreased in size . Retrocardiac opacity persists and may reflect atelectasis , although aspiration or pneumonia should also be considered . Interval decrease in chest wall subcutaneous emphysema . No pneumothorax . Overall cardiac and mediastinal contours are stable .