Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal , and hilar contours are unchanged , the heart size within normal limits . The mediastinal contour is not widened . Lungs are clear . The pulmonary vascularity is normal . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mediastinum is within normal limits without evidence of widening .