Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are slightly low but clear . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . The trachea is slightly shifted to the left .
    OUTPUT:
    
1 . No acute cardiopulmonary abnormality . 2 . Leftward shift of the trachea is likely due to thyroid enlargement , please correlate with physical exam . Updated results were telephoned to ___ ___ by ___ at 7 : 55 am , ___ , 15 minutes after discovery .