Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left subclavian Port - A - Cath ends in the mid SVC . The lungs are clear . Heart size is normal . A retrocardiac rounded opacity is most consistent with a large hiatal hernia and not significantly changed in size compared to radiograph from ___ . There are no pleural abnormalities .
    OUTPUT:
    
1 . No acute cardiac or pulmonary process . 2 . Unchanged large hiatal hernia .