Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large hiatal hernia occupying majority of the retrocardiac region . Where seen , the lungs are clear . There is no pulmonary vascular congestion . Cardiomediastinal silhouette is grossly within normal limits , noting that it is not well evaluated . Mid thoracic dextroscoliosis is noted . No acute osseous abnormality is identified .
    OUTPUT:
    
Large hiatal hernia without superimposed acute cardiopulmonary process .