Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . No confluent opacities identified . There is no pneumothorax . Cardiomediastinal and hilar contours are within normal limits . No definite rib fracture is identified on this chest radiograph examination .
    OUTPUT:
    
1 ) No acute cardiopulmonary process . No pneumothorax . 2 ) No definite rib fracture visualized . Dedicated rib views could be considered if there is ongoing clinical concern . 3 ) Slight posterior angulation of the xiphoid . In the absence of focal tendnderness , this likely represents normal variation rather than traumatic injury . Sternum otherwise within normal limits radiographically .