White moss from intestinal ulcers does not necessarily mean cancer. Some ulcerative colitis may also have white moss from ulcers. Whether this condition is benign or malignant, and if it is malignant what type it is, a part of the ulcer tissue needs to be removed by colonoscopy and sent to the pathology department for laboratory tests before the final diagnosis can be made. If the pathology shows that it is malignant, other examinations, such as CT or MRI of the pelvis, CT of the chest and abdomen, are needed to check the degree of local invasion of the tumor, whether there are metastases in the regional lymph and other distant organs, etc., so as to formulate a specific clinical staging and the corresponding treatment plan according to the clinical staging.