Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large retrocardiac opacity with component of air compatible with a large hiatal hernia . Faint left basilar opacity seen laterally is likely atelectasis . Elsewhere , lungs are clear . Cardiac silhouette is top - normal . No acute osseous abnormalities . Surgical clips in the right upper quadrant suggest prior cholecystectomy .
    OUTPUT:
    
Large hiatal hernia . No definite acute cardiopulmonary process .