Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Large retrocardiac air - fluid level is consistent with a large hiatal hernia . There is adjacent atelectasis . No focal consolidation is seen . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Hiatal hernia . No acute cardiopulmonary process .