转移是恶性肿瘤的重要特征,也是癌症患者死亡的主要原因。大肠癌是我国最常见的恶性肿瘤之一,目前对其局部原发肿瘤,采取手术为主的治疗方法基本可以控制,但根治术后肿瘤的复发和转移率高达50%左右[1]。早期认识有无肿瘤转移、转移方式及范围对临床诊断、治疗及预后判断具有重 Metastasis is an important feature of malignant tumors and it is also a major cause of death in cancer patients. Colorectal cancer is one of the most common malignancies in China. At present, the surgical treatment of local primary tumors can be basically controlled, but the recurrence and metastasis rate after radical resection is as high as 50% [1]. Early recognition of tumor metastasis and the mode and scope of metastasis are important for clinical diagnosis, treatment, and prognosis