Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax . There is unchanged rightward deviation of the cervical trachea .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary abnormality . 2 . Mass effect on the trachea with a rightward deviation similar to the prior study may reflect enlargement of the left lobe of the thyroid .