CT can detect intestinal occupying lesions, but it cannot confirm intestinal tumor. CT can detect the occupying lesion, and then colonoscopy can be performed for the occupying lesion, and the pathological tissue can be removed, and if cancer cells can be found under the microscope, the diagnosis of intestinal cancer can be confirmed. Of course, intestinal tumors also include lymphoma or metastasis. Therefore, for occupying lesions detected by CT, colonoscopy must be done in time to confirm whether it is intestinal tumor. These tumors can be benign tumors such as polyps, which are not clearly detected by CT, so CT can only detect part of intestinal tumors.