目的　探索食管癌外侵与转移时的CT表现 ,以便临床正确估价食管癌手术切除的可能性。方法　对 30例食管癌患者的术前影像和术后标本进行了观察。结果　①食管壁厚度≤ 1cm ,癌肿多限于壁内浸润 ;壁厚 2cm时 ,外侵率为 5 1% ,3cm时外侵率达 79% ,>3cm者外侵率高达 10 0 %。②癌肿与主动脉接触范围 >1/4周径时 ,主动脉受侵率高达 73.7% ;接触角度 >90°时 ,主动脉受侵率达 6 8.8%。③癌肿相邻气管、支气管呈陷入型改变时其受侵率可达 75 %。本组术前判定食管癌有无外侵的准确率为90 .3%。结论　CT可在术前正确判断肿瘤切除的可能性 ,可使部分食管癌病例避免不必要的剖胸探查。 Objective To explore the CT appearances of esophageal cancer invasion and metastasis so as to evaluate the possibility of surgical resection of esophageal cancer. Methods Preoperative images and postoperative specimens of 30 patients with esophageal cancer were observed. Results 1 The esophageal wall thickness was less than 1cm. Most of the cancers were limited to infiltrating in the wall. When the wall thickness was 2cm, the external invasion rate was 51%, the external invasion rate was 39%, and the external invasion rate was as high as 10%. 2 The range of contact between the tumor and the aorta was> 73%, the aortic invasion rate was as high as 73.7%; when the contact angle was >90°, the aortic invasion rate was 6.8%. 3 When the adjacent trachea and bronchus of the cancer were trapped, the rate of invasion was up to 75%. The accuracy of preoperative assessment of esophageal cancer with or without external invasion was 90.3%. Conclusion CT can correctly judge the possibility of tumor resection before surgery, and can avoid unnecessary exploratory thoracotomy in some cases of esophageal cancer.