Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal with a mildly tortuous aorta . Hilar contours are normal . Lungs are clear . There is no pleural effusion or pneumothorax . Severe degenerative changes are noted in bilateral shoulders . A slight indentation of the trachea on the right at the level of the thoracic inlet is suggestive of enlarged thyroid .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Slight indentation of the right aspect of the trachea at the level of thoracic inlet , suggestive of enlarged thyroid .