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:.
What is colon or rectum cancer?
Can you address the difference between anal cancer and rectal cancer? Does squamous cell always mean the cancer is anal, even if found in the rectum? What if HPV is found in the tumor? Wouldn't this indicate the cancer came from a sexually transmitted virus? Anal cancer is a rare type of cancer that arises from the lining of the anus. The anus is lined by skin cells and, as a result, most of the anal cancers are squamous. On the other hand, the rectum is internal and is the lower part of the colon that connects the colon to anus. As rectal cancer arises from the mucosa or lining, it is typically an adenocarcinoma in other words, cancer of glandular tissue. The risk of HPV infection increases with increased sexual activity.
How does the doctor know I have colorectal cancer?
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.
Anal cancer occurs in the anus, which is at the end of the gastrointestinal tract. It is different from and less common than colorectal cancer, which is cancer of the colon or rectum. Anal cancer is rare, but the number of new cases is rising. Of these, 5, will affect females, and 2, will affect males. The ACS expect around 1, people to die from anal cancer, including females and males. Anal cancer is rare before 35 years of age.