Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild central pulmonary vascular congestion . No focal consolidation to pneumonia . No pleural effusion . The heart is moderately enlarged . The descending thoracic aorta is tortuous . Patient has had prior median sternotomy valve replacement which appear intact . No pneumothorax . Mediastinum is not widened . No acute osseous abnormality . Extensive degenerative changes are seen in the visualized thoracic spine .
    OUTPUT:
    
Moderate cardiomegaly and mild pulmonary vascular congestion .