ＣＴ和螺旋ＣＴ作为双对比造影和内镜的重要补充手段，在显示癌肿的肠壁和肠外浸润、周围脏器和淋巴结等方面有独特的优势，在临床上发挥着越来越重要的作用。１　主要ＣＴ征象１－１　肠壁增厚在肠腔充分扩张的前提下，肠壁的厚度一般应小于５ｍｍ。癌肿可引起肠壁部分或环周 CT and spiral CT, as an important complementary measure of dual-contrast angiography and endoscopy, have unique advantages in displaying the intestinal wall and extraintestinal infiltration of the cancer, surrounding organs and lymph nodes, etc., and play an increasingly important clinical role effect. 1 main CT signs 1-1 thickening of the intestinal wall in the intestinal cavity under the premise of full expansion, the thickness of the intestinal wall should generally be less than 5mm. Cancer can cause part or peri-intestinal wall