Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged , increased since ___ . Mediastinal silhouette and hilar contours are unremarkable . The lungs are clear . The pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mild enlargement of the cardiac silhouette as compared to ___ , but without evidence of fluid overload . Mild hyperinflation .