Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly to moderately enlarged . The mediastinal and hilar contours appear unremarkable . Atherosclerotic calcifications seen at the aortic arch . The lungs are clear of consolidation . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild to moderate enlargement of the cardiac silhouette .