Colorectal polyps, also known as bowel polyps or colonic polyps, are small abnormal growths that can occur on the lining of the colon or rectum wall.1,2
The majority of polyps commonly measure from a few millimetres to one centimetre in size, and can either be flat or have a stalk.
While they are mainly benign, if left untreated for many years colorectal polyps can become malignant and develop into colorectal cancer. This will depend on the histological type of polyp, as outlined below.
- Tubular adenoma – lowest risk
- Tubulo-villous adenoma – medium risk
- Villous adenoma – highest risk
Polyps that are larger than two centimetres are also significantly more likely to become cancerous.