Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly and mild tortuosity of the thoracic aorta is unchanged . Hilar contours are unremarkable . A large midline retrocardiac density is unchanged from prior examination compatible with hiatal hernia . Lungs are clear . The pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
1 . No acute cardiopulmonary abnormality . 2 . Re - demonstration of a large hiatal hernia .