Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged but unchanged . The mediastinal and hilar contours are normal . Mild pulmonary vascular congestion is similar compared to the prior study . No focal consolidation , pleural effusion or pneumothorax is present . Moderate degenerative changes are seen in the thoracic spine . No subdiaphragmatic free air is noted .
    OUTPUT:
    
Mild pulmonary vascular congestion , as seen previously . No new focal consolidation . No subdiaphragmatic free air .