Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are provided . The lungs are clear . A retrocardiac density containing air - fluid levels , compatible with a hiatal hernia , unchanged . The cardiomediastinal silhouette is stable . There is mild atherosclerotic calcification noted along the thoracic aortic knob . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Stable hiatal hernia . No acute findings .