Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . A retrocardiac opacity is again seen likely with representing known hiatal hernia . The lungs are clear without focal consolidation , large effusion or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures appear intact . Focal eventration of the right hemidiaphragm is noted .
    OUTPUT:
    
Hiatal hernia re-demonstrated . No acute intrathoracic process . Please refer to subsequently performed CTA chest for further details .