Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is again noted to be a retrocardiac opacity which is compatible with known hiatal hernia . The lungs are clear . No signs of pneumonia or CHF . No pleural effusion or pneumothorax . Old right posterior upper rib cage deformity is noted . Otherwise , the bony structures are unremarkable .
    OUTPUT:
    
Hiatal hernia again noted . No signs of pneumonia .