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Colon cancer
Differentiation between Colon Polyps and Colon Cancer
The most distinct diagnostic criteria between colon polyps and colon cancer are that colon polyps are benign lesions, whereas colon cancer is a malignant tumor of the intestines. Colon polyps are generally small in size or present as multiple polyps, with localized mucosal elevation. They may appear the size of mung beans or be pedunculated, and may be accompanied by mild abdominal pain, generally without blood in the stool. In contrast, during the onset of colon cancer, there is usually abdominal pain accompanied by bloody stools. In the later or advanced stages of colon cancer, after the tumor ruptures, it may also lead to severe gastrointestinal bleeding, as well as overall bodily wasting and anemia. The prognosis for colon polyps is relatively good; regular follow-up checks are sufficient. However, for colon cancer, if detected early, surgical removal can be an option. The survival rate in the middle and late stages is lower than in the early stage, and treatment may require a combination of radiotherapy and chemotherapy.
Is colon cancer surgery a major surgery?
Colon cancer surgery is considered a relatively major procedure, ranking as a class three or four surgery in general surgery. Generally, it involves the resection of the entire transverse colon or tumors located in other areas such as the ascending or descending colon, accompanied by the removal of surrounding lymph nodes, followed by intestinal anastomosis and digestive tract reconstruction. Post-surgery, comprehensive anti-tumor treatment is usually required. After colon cancer surgery, the main focus is on preventing intestinal leakage, which is a serious complication. Dietary intake needs to be gradually restored after surgery. Initially, the patient may only be able to consume liquid and easily digestible foods, gradually transitioning to semi-liquid and regular diets, while also paying attention to eating smaller, more frequent meals.
How to defecate after transverse colon cancer surgery
If transverse colon cancer is treated with curative resection surgery and no stoma creation, the anus is preserved, and defecation occurs through the original anus. If a colostomy is performed after surgery for transverse colon cancer, defecation occurs through an artificial anus, typically located in the lower left abdomen. There can be opportunities to reverse the stoma later if necessary. Even with a stoma, patients can gradually adapt. The main focus is always on completely removing the tumor. Generally, postoperative adjuvant chemotherapy is also used to control the condition.
The most common symptoms of transverse colon cancer
The most common symptoms of transverse colon cancer mainly include abdominal pain, bloody stools, and changes in stool characteristics, such as thinner stools, which can sometimes lead to severe symptoms of intestinal obstruction. After these symptoms appear in transverse colon cancer, it is advisable to undergo a colonoscopy as soon as possible. Pathology obtained through the colonoscopy can confirm the diagnosis. Once transverse colon cancer is confirmed, it is also necessary to check for metastases to other parts of the body. For non-metastasized cases, early surgical treatment should be carried out, including a radical surgery for transverse colon cancer with lymph node dissection. Postoperative comprehensive anti-tumor treatment is generally required, involving six to eight courses of adjuvant chemotherapy. Postoperative chemotherapy aims to prevent local recurrence and distant metastasis.
What to do about liver metastasis from transverse colon cancer?
Liver metastasis in transverse colon cancer is relatively common, especially in cases where the disease has progressed. Because the transverse colon is located close to the liver region, tumors in this area can potentially metastasize to the liver via the lymphatic or blood circulation, or through local infiltration. In cases where the liver metastasis is localized, there is still an opportunity for surgical treatment involving a radical resection of the transverse colon cancer combined with partial hepatectomy. If there are multiple metastases in the liver, radical surgery may not be feasible. Initially, preoperative neoadjuvant chemotherapy or targeted therapy is performed. If the liver metastatic lesions can be reduced or disappear, there may still be a chance for surgical treatment afterwards.
Is lower right abdominal pain colon cancer?
Pain in the lower right abdomen does not necessarily indicate colon cancer, as there are many possible causes of this pain. Common conditions include acute or chronic appendicitis, gynecological diseases such as pelvic inflammatory disease, torsion of a right ovarian cyst, ectopic pregnancy, and others. Additionally, urological issues like a stone in the lower part of the right ureter can cause severe pain in the lower right abdomen, which are again not indicative of colon cancer. Gastrointestinal diseases like Crohn's disease often lead to pain in the lower right abdomen. Of course, tumors in the ileocecal area or ascending colon can also cause such pain. Hence, while lower right abdominal pain is not necessarily due to colon cancer, in rare cases, it could be.
The difference between rectal cancer and colon cancer lies in the location of the cancer. Rectal cancer occurs in the rectum, which is the final part of the large intestine, while colon cancer occurs in other parts of the colon.
Rectal cancer and colon cancer are collectively referred to as colorectal cancer, named according to the different locations where the tumors occur. Rectal cancer occurs in the rectum. Colon cancer includes tumors in the transverse colon, descending colon, ascending colon, and sigmoid colon, and tumors in these areas are called colon cancer. Both are known as colorectal cancer, and they exhibit similar clinical manifestations, including rectal bleeding, abdominal pain, and changes in bowel habits, such as constipation, diarrhea, alternating constipation and diarrhea, and changes in stool shape, such as narrowing of the stool. They are merely named differently based on the location of the tumors and are collectively referred to as colorectal cancer.
Is minimally invasive surgery suitable for transverse colon cancer?
Transverse colon cancer can also be considered for minimally invasive surgical treatment. The main procedure involves a complete resection of the transverse colon, and sometimes, it may require the resection of part of other organs. For instance, if the cancer has invaded the splenic region of the colon, a splenectomy may be necessary. If there is invasion into the liver area, partial liver resection may be needed. In cases where minimally invasive surgery is not suitable or inconvenient, it is also possible to switch to open surgery. The goal is to completely remove the tumor. Whether minimally invasive or traditional surgery is used, it is just a method of operation. Additionally, postoperative adjunct chemotherapy and other comprehensive treatments are necessary.
What are the symptoms of transverse colon cancer?
Transverse colon cancer is a type of colon cancer, belonging to malignant tumors of the digestive system. The main symptoms may include rectal bleeding, narrower stools, increased frequency of defecation, diarrhea, and it may also cause constipation. For instance, if the tumor in the transverse colon is large enough to block the intestinal lumen, it could lead to difficulty in defecating. Constipation or even signs of intestinal obstruction could occur. Generally, a diagnosis can be confirmed through an endoscopic biopsy. After diagnosis, transverse colon cancer can be treated surgically, primarily through curative surgery, followed by adjuvant chemotherapy and other comprehensive treatments.
Colorectal Cancer CT Manifestations and Differential Diagnosis
Early-stage colon cancer is difficult to clearly detect on a CT scan. In the moderate to late stages, colon cancer has more typical manifestations on CT, mainly characterized by thickening of the colon wall, irregular narrowing of the intestinal lumen, and stiffness of the intestinal wall. After enhancement, significant enhancement can be observed. The pericolonic fat space may appear blurred, and in the late stages, small lymph nodes can be seen, and even distant metastasis, most commonly to the liver, can be detected. It is necessary to differentiate colon cancer from colonic inflammation. Inflammatory lesions are usually more widespread and have typical clinical features such as fever and abdominal pain. It is also necessary to differentiate from lymphoma, as lymphomas also cause narrowing of the intestinal lumen but the narrowing is not eccentric and the intestinal wall remains soft, generally not leading to obstruction, whereas in late-stage colon cancer, colonic obstruction can be observed.