Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Subtle linear density in the right lower lung is likely indicative of scarring . A retrocardiac bulbous opacity is most compatible with a small hiatal hernia . Lungs are clear without focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Small retrocardiac density is compatible with hiatal hernia . No signs of pneumonia or edema .