Benign colon tumor

Disease Description (Causes and Symptoms)

• Definition: A benign colon tumor (polyp) refers to an abnormal lump (protruding lesion) arising from the colonic mucosa or submucosa. It is classified as epithelial (adenomatous, hyperplastic, inflammatory, etc.) or non-epithelial (lipoma, carcinoid tumor, leiomyoma, etc.).
• Causes and pathophysiology: It occurs due to abnormalities in the regulation of proliferation and differentiation of colonic epithelial cells. In particular, adenomatous polyps may develop due to genomic changes and environmental factors (increased intake of fat and red meat, exposure to bile acids, etc.), and some adenomas may progress to cancer over several years (usually 5–10 years).
• Main symptoms: Most are asymptomatic (found incidentally during testing). When symptoms occur, they may include bloody stool and mucus in the stool; if the polyp is large, it may cause intestinal obstruction, abdominal pain, constipation, or diarrhea. Juvenile polyps in children may cause rectal bleeding or prolapse.

Treatment Methods

• Diagnostic evaluation: Fecal occult blood test (screening), CT colonography, colonoscopy (allows complete examination and biopsy), and magnifying endoscopy for detailed observation of lesions.
• Removal (general principle): Because it is difficult to predict the possibility of malignancy, removal is generally recommended for most polyps.
  • Cold biopsy forceps: Usually used to remove small polyps 5 mm or smaller.
  • Polypectomy (snare): Standard endoscopic resection, usually for lesions 2 cm or smaller.
  • Endoscopic mucosal resection (EMR): The lesion is resected after injecting saline or another solution into the submucosa; it can be used for lesions up to approximately 3 cm.
  • Piecemeal resection (piecemeal EMR): A large lesion is removed in sections.
  • Endoscopic submucosal dissection (ESD): The mucosa and submucosa are dissected and the lesion is removed en bloc; it is also used for larger lesions or early cancer.
• Drug treatment: There is no specific drug treatment. Treatment of underlying conditions, such as inflammatory polyps (including control of inflammatory bowel disease), may be needed separately.
• Lifestyle management: Increase dietary fiber intake, eat fruits and vegetables, limit saturated fat, red meat, and excessive calorie intake, maintain a normal body weight, quit smoking, and limit alcohol consumption.
• Precautions (before and after the procedure):
  • Be sure to inform your doctor whether you are taking anticoagulants or antiplatelet drugs, and follow your doctor’s instructions regarding whether they need to be stopped.
  • Visit a medical institution immediately if bleeding, abdominal pain, fever, or severe vomiting occurs after endoscopic resection.
  • Depending on the pathology results after resection, additional treatment (follow-up endoscopy, surgery, etc.) may be needed.
• Risk of complications: Bleeding, perforation, and infection (rare). Some submucosal tumors, such as carcinoid tumors, may undergo malignant transformation or metastasize.
• Prognosis: The prognosis is generally good when most polyps are removed. Adenomatous polyps are precursors to cancer, and the future risk of cancer varies depending on their size, cell type, and degree of dysplasia (for example, the rate of malignant transformation is low for adenomas smaller than 1 cm, while the risk increases at 2 cm or larger).

Checklist Before an Outpatient Visit (Including Sample Questions)

• Items/documents to bring:
  • List of medications currently being taken (especially anticoagulants, antiplatelet drugs, antidiabetic medications, supplements, etc.)
  • Previous surgeries and medical history (especially colon-related surgery, inflammatory bowel disease, or a history of cancer)
  • Results and reports from previous fecal occult blood tests, colonoscopies, and CT scans, if available
  • Symptom records (the onset, frequency, and severity of bloody stool, mucus in the stool, abdominal pain, or changes in bowel movements), and records of weight changes
  • Family history (colorectal cancer, polyps, etc.)
  • Lifestyle information (dietary habits, smoking and alcohol use)
• Sample questions to prepare for the outpatient visit:
  • When did the symptoms begin, and what were they like? How much bleeding was there, and how often did it occur?
  • Do any of the medications taken recently need to be stopped?
  • Have polyps ever been removed during a previous colonoscopy?

General Sample Questions to Ask the Doctor

• What is the risk that this polyp (or the pathology result) will become cancerous?
• Which removal method do you recommend for me, and what are the risks of complications during and after the procedure and the recovery time?
• Are there any medications that I need to stop taking before or after the procedure?
• What should the interval be for follow-up tests (endoscopy) after removal?

Disease-Specific Sample Questions

• The pathology report says “adenoma” or “high-grade dysplasia.” Is additional resection or surgery necessary?
• A submucosal tumor (such as a lipoma, carcinoid tumor, or leiomyoma) is suspected. Can it be completely removed by endoscopic resection (EMR/ESD), or how likely is surgery to be necessary?

(Note: The interval for follow-up tests and the decision regarding the procedure vary depending on the number and size of lesions, histological findings, and the patient’s overall condition. The final decision should be made in consultation with the treating medical team.)