The inner lining of the anal canal is the mucosa. Most anal cancers start from cells in the mucosa. Glands and ducts tubes leading from the glands are found under the mucosa. The glands make mucus, which acts as a lubricating fluid. Anal cancers that start from cells in the glands are called adenocarcinomas. Anal cancers are often divided into 2 groups, which are sometimes treated differently:. The anal canal is surrounded by 2 sphincter muscles that keep the anus closed and prevent stool leakage.
Anal Cancer: How to Diagnose, Staging & Treatment - Dana-Farber Cancer Institute | Boston, MA
The anal canal is a short tube surrounded by muscle at the end of your rectum. The rectum is the bottom section of your colon large intestine. When you have a bowel movement, stool leaves your body from the rectum through the anal canal. As the cancer grows, it may stay in nearby tissues or spread to other parts of the body, a process called metastasis. Anal cancer starts in the cells around or just inside the anal opening.
Back to Health A to Z. Anal cancer is a rare type of cancer that affects the anus the end of the bowel. The symptoms of anal cancer are often similar to more common and less serious conditions affecting the anus, such as piles haemorrhoids and small tears or sores called anal fissures. See a GP if you develop any of these symptoms. While they're unlikely to be caused by anal cancer, it's best to get them checked out.