Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Th heart is mildly enlarged , as before . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen . There is a small hiatal hernia .
    OUTPUT:
    
1 . No acute cardiac or pulmonary process . 2 . Small hiatal hernia .