Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs were obtained . The lungs are well expanded and clear . There is no focal consolidation , effusion , or pneumothorax . A large upper mediastinal mass , stable in size , continues to cause leftward deviation of the trachea . The aorta is mildly tortuous . There are no other abnormal cardiac or mediastinal contours .
    OUTPUT:
    
Unchanged appearance of large upper mediastinal mass which deviates the upper airway .