Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size appears mildly enlarged , increased from the previous study . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . Lungs are clear . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Mild enlargement of the cardiac silhouette , increased from the previous radiograph , without evidence of congestive heart failure .