Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is no focal consolidation , effusion , or pneumothorax . Retrocardiac opacity is again seen which is compatible with a known hiatal hernia . The cardiomediastinal silhouette is Stable . Imaged osseous structures are intact . Chronic right upper rib cage deformities noted . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . Retrocardiac opacity consistent with known hiatal hernia . 2 . No pneumonia or edema .