Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable frontal chest radiograph was obtained . There is a large hiatal hernia . No NG tube is seen The aortic arch is enlarged . The aerated right lung is small , partially artifactual due to patient positioning , and partially due to rightward mediastinal shift . There is no focal consolidation , effusion , pneumothorax .
    OUTPUT:
    
Large hiatal hernia . Please refer to subsequent CT for further details .