Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy , aortic valve replacement , and CABG . Severe enlargement of the cardiac silhouette is unchanged . The mediastinal and hilar contours are similar . Mild pulmonary vascular congestion is not substantially changed from the prior study . There is no focal consolidation , pleural effusion or pneumothorax . No acute osseous abnormality is present .
    OUTPUT:
    
Severe cardiomegaly with mild pulmonary vascular congestion .