Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is stably enlarged . Again seen is pulmonary vascular congestion , possibly mildly improved since most recent examination . Again noted is retrocardiac opacity , which may represent atelectasis . Small , bilateral pleural effusions are present . No pneumothorax identified .
    OUTPUT:
    
Persistent but improved edema .