CTVL could clearly demonstrate the location,size and extension of tumors,and by caudocranial approach,CTVL revealed the distal portion of tumor and the structure of subglottic region.

• CTVL能很好地显示肿瘤的部位、大小及侵犯范围，并可从足侧观察狭窄远端及声门下区的情况。