我国大肠多原发恶性肿瘤的发病率为 0 97%～12 8% [1] 。其实际发病率可能会更高 ,这可能与文献报道的资料多属回顾性有关。现将我院收治 3例报道如下。1　临床资料例 1,女 ,6 8岁。 1995年 12月以肠梗阻行剖腹手术 ,术中见乙状结肠肿瘤 ,行乙状结肠切除 ,端端吻合术。病理报 The incidence of multi-primary malignancies in the large intestine in China is 0 97% to 12 8% [1]. The actual incidence rate may be higher, which may be related to retrospective data. Now we have 3 cases reported in our hospital as follows. 1 Clinical data example 1, female, 6 8 years old. In December 1995, laparotomy was performed with intestinal obstruction. During the operation, sigmoid colon tumors were performed. Sigmoid resection and end-to-end anastomosis were performed. Pathology