For patients and family members of colon cancer, many times once diagnosed, they become anxious and disorganized, and before the examination is complete, they diagnose and treat themselves based on their so-called experience. In fact, colon cancer is not scary, and standardized treatment can make most patients (more than 50%) without distant metastasis get tumor cure, that is to say, comprehensive treatment with surgery as the core is the most effective method to cure colon cancer at present. In that case, what examinations should be done before surgery for colon cancer patients? 1.Examinations for confirming the diagnosis: colonoscopy and pathology Colonoscopy: it is recommended that patients without special conditions should complete the whole colonoscopy, the so-called whole colonoscopy means entering the mirror from the anus and need to observe the end of the ileum, i.e. including the ileocecal part; however, for patients with huge tumor, intestinal obstruction, or special conditions such as intestinal bleeding, partial colonoscopy for pathology is also acceptable (abdominal cavity needs to be performed again during surgical exploration). (the abdominal cavity needs to be explored again during surgical exploration). Pathology: pathological examination has always been the gold standard of examination, but at present, we often encounter such situations, pathological return: high-grade intraepithelial neoplasia, or superficial sampling, not excluding cancer; in these cases, it is still recommended that the pathological consultation in specialist hospitals, after all, this is a key issue related to the diagnosis of tumor, and needs to be highly valued! 2.Perfect staging examination: abdominopelvic enhanced CT, chest plain CT and blood sampling for tumor markers (CEA, etc.) Abdominopelvic enhanced CT: many people say, why do we need CT when colonoscopy is already clear? This is because CT can provide more information about the size, location, and relationship with the surrounding area of the lesion, which is very directly related to the treatment such as surgery. For tumors that are relatively small on CT, positioning is still needed before surgery to determine the extent of resection. For tumors that are more advanced on CT, especially for patients with large localized tumors and many surrounding lymph nodes, direct surgery is not necessarily the only option. In fact, besides the information of tumor, CT also needs to see whether there are metastases in other organs of abdominal cavity, such as common liver metastases, metastases in special lymph nodes of abdominal cavity, peritoneal metastases and so on. All these are important basis for tumor staging. Chest plain CT: With abdominopelvic enhancement CT, why do we need to do chest? This is because the common metastatic organ of colon cancer, besides liver, is lung. If the lung is not fully understood before surgery, it is likely to be missed, i.e. obviously multiple metastatic nodes in the lung, because they are not found, and simply define the surgery as radical, which is actually a problem in the treatment of quite a number of patients. 3. Standardized treatment plan development: in short, curable surgery, non-curable systemic chemotherapy, and multidisciplinary junction cases Patients with curable colon cancer (including colon cancer without preoperative metastases from other organs, and those who have metastases from other organs but can achieve radical resection) need a treatment strategy centered on surgery. This would include: surgical treatment, and possibly pre- and post-operative chemotherapy. Postoperative chemotherapy is currently more widely accepted, but for preoperative chemotherapy, many people feel that it delays surgery, which is actually inaccurate. Non-curable colorectal cancer (advanced tumor): a strategy centered on systemic treatment and surgical intervention when necessary. Fluent within the patient’s physical condition, systemic chemotherapy is recommended, and when there are special circumstances such as obstruction, bleeding, perforation, etc., surgery steps in when it’s time to step in!