患儿男，l岁半。因误咽铁钉一周入院。7天前患儿手拿铁钉平卧在床上玩时不慎掉入口中，之后不吃食物，哭叫，立即到当地看病，未见异物，用抗生素治疗两天不好转县医院治疗。行颈部X片正侧位检查时发现口咽平面可见长4cm铁钉一颗，尖端向下，铁帽向上。但行咽部检查时未发现异? Children male, l and a half years old. Due to aphasia nails a week hospitalization. 7 days ago, children with iron nails lying on the bed supine accidentally fell into the mouth, after eating food, crying, and immediately to the local doctor, no foreign body, two days with antibiotics did not improve county hospital treatment. X-ray examination of the neck is a lateral examination of the side of the oropharyngeal plane can be seen long 4cm iron nails, the tip down, iron cap up. However, the line was not found when the throat examination?