下咽癌症状出现晚，常在疾病的晚期作出诊断，因此存活率低。对肿瘤范围的评估和术前分期直接影响治疗结果。内窥镜检查可准确评估肿瘤的表面范围，但难以判断深部侵犯程度和肿瘤的下界。因此，需要ＣＴ和ＭＲＩ检查作为补充。文献报道ＣＴ可很好的显示大的软骨侵犯，对微小的 Hypopharyngeal cancer symptoms appear late, often in the late diagnosis of the disease, so the survival rate is low. The assessment of the extent of the tumor and the preoperative staging directly affect the outcome of the treatment. Endoscopy can accurately assess the surface area of ​​the tumor, but it is difficult to determine the extent of deep invasion and the tumor’s lower bound. Therefore, CT and MRI examinations are required as a supplement. The literature reports that CT can well show large cartilage violations, to tiny ones