Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low accentuating the cardiac silhouette and pulmonary vasculature . Heart size is top - normal with mild unfolding of the thoracic aortic arch . Hilar contours are unremarkable . There is a large hiatal hernia with adjacent atelectasis . Lungs are otherwise clear . Pleural surfaces are clear without effusion pneumothorax . Posterior thoracolumbar fixation hardware is partially imaged .
    OUTPUT:
    
1 . No acute cardiopulmonary abnormality . 2 . Large hiatal hernia .