Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Retrocardiac opacity is slightly increased compared to ___ , but overall similar to ___ , likely atelectasis . Moderate cardiomegaly is unchanged . Bilateral hilar enlargement is due largely to adenopathy seen on ___ chest CT and enlarged pulmonary arteries . Upper lobe vascular congestion is similar . No pleural effusion , overt pulmonary edema , or pneumothorax .
    OUTPUT:
    
No pulmonary edema .