患儿，男，13岁。半月前被气枪子弹射入预前正中部，来院前曾在当地医院从原射入孔道试取水成功。1992年5月3日收住院。体检：一般情况好，颈前正中舌骨与甲状软外间有一长3cm横行外科切口，缝线已拆，顿正倒位X线片示第四颈椎前舌骨与甲状软骨间距皮下约3cm处有一不透光0．5cm Children, male, 13 years old. Half a month ago was airsoft bullets into the pre-center, to the hospital before the hospital from the original injection hole test water success. May 3, 1992 admitted to hospital. Physical examination: the general condition is good, there is a long 3cm transverse surgical incision between the anterior median cervical hyoid bone and the soft outer thyroid. The suture has been dismantled. The positive posterior inverted X-ray shows the distance between the anterior hyoid bone of the fourth cervical vertebra and the thyroid cartilage about 3cm subcutaneously Not transparent 0.5cm