Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . The pulmonary vascularity is normal and the lungs are clear . There is mild hyperinflation of lungs with flattening of the diaphragms . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities . Radiopaque device is seen projecting over the midline lower thorax , which is either external to the anterior chest wall or within it .
    OUTPUT:
    
No acute cardiopulmonary abnormality .