Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . The mediastinal and hilar contours are normal . The lungs are clear . There is no pleural effusion or pneumothorax . Examination of the bones demonstrates no displaced rib fracture . Examination of the sternum demonstrates a horizontally oriented lucency through the sternum in the expected region of the sternomanubrial interface which does not appear displaced .
    OUTPUT:
    
No acute cardiopulmonary process ; no evidence of fracture .