Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . A dual - lead pacemaker is in place in standard position on this view . The heart size is top normal , unchanged . There is a retrocardiac opacity likely representing a hiatal hernia . Hilar and mediastinal contours are unremarkable . Lungs are clear and there is no pleural effusion or pneumothorax . There is increased lung volumes .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Hiatal hernia .