Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrates the lungs are relatively well expanded and clear . No pleural effusion , focal opacity or pneumothorax is present . There is no evidence of pulmonary edema . A large retrocardiac hiatal hernia is again seen . The heart size is stable . There are no signs of aspiration .
    OUTPUT:
    
No acute cardiopulmonary process . Large hiatal hernia .