Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal with mild tortuosity of the thoracic aorta . Mild widening of the mediastinal contour is unchanged from ___ . Linear opacities in the right middle lobe are unchanged and likely represent scarring or atelectasis . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax . Elevation of the right hemidiaphragm is unchanged and a hiatal hernia is slightly smaller than ___ .
    OUTPUT:
    
No acute cardiopulmonary abnormality .