Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild pulmonary edema . Left base retrocardiac opacity is seen , which could be due to atelectasis , although infection or aspiration is not excluded . No large pleural effusions are seen . There is no pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Mild pulmonary edema . Patchy left base retrocardiac opacity could be due to atelectasis , although consolidation due to infection or aspiration is not excluded .