Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal and lateral view of the chest demonstrates no pleural effusions . The lungs are clear . The cardiomediastinal and hilar contours are normal . A retrocardiac density is consistent with a hiatal hernia . There is no pneumothorax . Pleural surfaces are unremarkable .
    OUTPUT:
    
No pleural effusion . Likely hiatal hernia .