Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postoperative mediastinum , hila , and mild cardiomegaly are unchanged from ___ . Mild pulmonary vascular congestion without frank pulmonary edema and trace pleural effusions . Mild bibasilar scarring is unchanged . No pneumonia or pneumothorax .
    OUTPUT:
    
Mild pulmonary vascular congestion without pulmonary edema .