Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Implanted anterior chest wall of device is noted . The lungs appear clear . A retrocardiac gas filled structure could represent a small hiatal hernia . Cardiomediastinal silhouette appears grossly unremarkable . Bony structures are intact . No free air is seen below the right hemidiaphragm .
    OUTPUT:
    
Probable small hiatal hernia . Otherwise unremarkable .