Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . There is leftward deviation of the trachea at the thoracic inlet . The mediastinal and hilar contours are otherwise normal . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Leftward deviation of the trachea at the thoracic inlet . This may be secondary to goiter or Zenker 's diverticulum . Recommend correlation with physical exam findings . Otherwise , no acute cardiothoracic abnormality .