Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . Mediastinal and hilar contours are stable with calcifications of the aortic knob . There is no large pleural effusion or pneumothorax . Lungs are clear . Pulmonary vasculature is within normal limits . Again noted is a hiatal hernia .
    OUTPUT:
    
No acute cardiopulmonary process .