Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well expanded and clear . There is a large hiatal hernia but cardiomediastinal and hilar contours are unremarkable otherwise . There is no pleural effusion or pneumothorax . Pacemaker in the left hemithorax with a single lead ending in the right ventricle .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .