Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The trachea at the level of the thoracic inlet is mildly narrowed . Cardiac silhouette and hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mild narrowing of the trachea at the thoracic inlet could suggest goiter .