darmpoliepen

Darmpoliepen (intestinal polyps) are noncancerous mucosal growths that project into the lumen of the gastrointestinal tract, most often in the colon and rectum. They vary in size and number and are frequently discovered during routine screening. Most polyps do not cause symptoms, but larger lesions can cause rectal bleeding, anemia, or changes in bowel habits. Some polyps, especially adenomatous polyps, carry a risk of progression to colorectal cancer over time.

Types include adenomatous polyps (adenomas), hyperplastic polyps, inflammatory polyps, and hamartomatous polyps. Adenomas are the most important clinically because they can become malignant; they are further categorized as tubular, villous, or tubulovillous. Hyperplastic polyps are usually small and benign. Inflammatory polyps occur with inflammatory bowel disease. Hamartomatous polyps appear in certain genetic syndromes, while serrated polyps (including sessile serrated lesions) also contribute to cancer risk through a separate pathway.

Risk factors for developing darmpoliepen include age, a family history of colorectal polyps or cancer, and hereditary syndromes such as familial adenomatous polyposis (FAP), MUTYH-associated polyposis, and Lynch syndrome. Lifestyle factors like obesity, smoking, a high-fat diet, and low physical activity may contribute. Inflammatory bowel diseases increase the risk of polyp formation and associated cancer.

Diagnosis is typically made during screening colonoscopy, when polyps are seen and removed for histological examination. Other methods include flexible sigmoidoscopy, CT colonography, or barium enema. The histology after removal determines surveillance intervals and the need for further treatment.

Treatment consists of removing polyps endoscopically during colonoscopy (polypectomy) or, for large or difficult lesions, surgical resection. Regular follow-up colonoscopy is recommended to monitor for new polyps, with interval decisions based on polyp size, number, histology, and completeness of removal. Effective polyp removal reduces the risk of colorectal cancer.