Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . The hilar and mediastinal contours are within normal limits . There is no pneumothorax , focal consolidation , or pleural effusion . A round well - circumscribed left retrocardiac opacity corresponds to a known large hiatal hernia .
    OUTPUT:
    
1 . Unchanged large hiatal hernia . 2 . No focal consolidation .