Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation , pleural effusion or pneumothorax . The heart size is normal . Again noted is a retrocardiac density containing an air - fluid level consistent with a moderate to large hiatal hernia . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
No acute intrathoracic process . Moderate to large hiatal hernia re - demonstrated .