Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Cardiac silhouette size remains moderate to severely enlarged , unchanged . Mediastinal and hilar contours are similar . Mild pulmonary vascular congestion is present , as seen previously . No focal consolidation , pleural effusion or pneumothorax is clearly identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Moderate to severe cardiomegaly with mild pulmonary vascular congestion .