Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate well expanded lungs . Increased retrocardiac opacity with multiple air - fluid levels is consistent with the patient 's known large hiatal hernia . Cardiomegaly is stable . There is no pneumothorax , pleural effusion , or consolidation .
    OUTPUT:
    
No acute cardiopulmonary process .