大肠癌的ＣＴ表现一般为球形或环形软组织肿块，肠壁增厚，肠腔狭窄，变形，而表现为腔外囊性肿块的很少见，现将我们所见２例报告如下：例１男，４５岁。１２年前发现右中上腹部有一鸡蛋大小肿块，后逐渐增大，近３月来因伴腹痛而就诊。体检：右中腹部触及一约８ｃｍ×１... Colorectal cancer CT manifestations are generally spherical or annular soft tissue mass, intestinal wall thickening, intestinal lumen stenosis, deformation, and the performance of extraluminal cystic mass is rare, now we have seen 2 cases are reported as follows: Example 1 male , 45 years old. Twelve years ago, it was found that there was an egg mass in the right middle and upper abdomen, which gradually increased. In the past 3 months, she had been diagnosed with abdominal pain. Physical examination: the right middle stomach touches about 8cm × 1...