![]() If an adenocarcinoma is described as infiltrating or invasive, it means the cancer cells have grown deeper than the top layers of the polyp or colon/rectal lining ( mucosa), so this is a true cancer (and not a pre-cancer). Still, people who have one of these findings in an adenoma will likely need colonoscopies more often in the future to look for more polyps. While an adenoma with one of these conditions still needs to be removed completely, this is not the same as having a true colon or rectal cancer, since it cannot spread. This type of early cancer does not yet have the ability to spread to other parts of the body, so it may be called a pre-cancer. This might be described with one of these terms: Sometimes on a biopsy, cells that look like cancer cells are found only in the top layers of the polyp or of the colon/rectal lining (called the mucosa). Other types of tumors or cancers can also start in the colon or rectum, although these are much less common than adenocarcinomas. This is the most common type of colon cancer. ![]() Adenocarcinoma of the colon (or rectum)Īdenocarcinoma is a type of cancer that starts in the gland cells that make mucus to lubricate and protect the inside of the colon and rectum. Most cancers that start in the colon or rectum are carcinomas (specifically adenocarcinomas – see below). Types of cancer that might be found in a colon or rectal polyp CarcinomaĬarcinoma is the general medical term for a cancer that starts in the cells that line the insides of organs such as the colon or rectum. But if cancer develops in an adenoma, the type of the adenoma is not as important in terms of treatment as other factors (see below). The type of adenoma affects how likely it is to contain cancer cells. To learn more about adenoma types, see Your Colon or Rectal Pathology Report: Polyps.
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