食管癌由于其自身生物学特点使其就诊时多为中晚期,因此,放射治疗是中晚期食管癌的主要治疗方式。而三维适形放射治疗(3DCRT)能够提高靶区的适形度,减少靶区周围正常器官和组织的照射剂量,并保护周围正常组织,并为食管癌治疗提供了新的研究方向。本研究通过对食管癌淋巴结转移模式和临床失败模式来分析食管的CTV范围。 Esophageal cancer because of its own biological characteristics make it more often in the treatment, therefore, radiation therapy is the main treatment of advanced esophageal cancer. Three-dimensional conformal radiotherapy (3DCRT) can improve the conformality of the target area, reduce the dose of normal organs and tissues around the target area and protect the surrounding normal tissue, and provide a new research direction for the treatment of esophageal cancer. In this study, the esophageal CTV range was analyzed by lymph node metastasis patterns and clinical failure patterns of esophageal cancer.