Colorectal intramucosal carcinoma, also known as colorectal mucinous carcinoma, belongs to a pathological type of colorectal adenocarcinoma, which refers to the fact that there is a lot of mucus content in the cancer cells when viewed on section. Colorectal mucinous carcinoma is highly malignant and prone to metastasis and recurrence. The causes of colorectal mucinous carcinoma are mainly related to hereditary and dietary factors, especially to genetic factors. If there are people with genetic history of gastrointestinal tumor in the family, they must pay attention to it and have regular medical checkups in the hospital. Unhealthy diet, such as frequent consumption of spicy and stimulating food, is also likely to lead to colorectal mucinous carcinoma. The disease is often characterized by abdominal pain, blood in the stool, and mucus in the stool. Colorectal mucinous carcinoma is not sensitive to radiotherapy and chemotherapy, and surgical resection is still its main treatment means. Surgical treatment methods mainly include: radical surgery and palliative surgery. If in the late stage of tumor, the patient’s physical condition is very poor and the symptoms are obvious, in order to relieve the symptoms, palliative surgery can be chosen, this kind of surgery can not completely remove the tumor, but can improve the patient’s life treatment. If the patient is in good physical condition and the tumor is in the early to middle stage, radical surgery can be chosen to completely remove the tumor and clear the surrounding lymph nodes. Regular review after surgery.