Cancer of the anus is characterized by the unchecked growth of abnormal cells in the anus. The anus is the final portion of the large intestine and serves as the exit point for solid waste from the body. Cancer of the ano and cancer of the rectal can require very different treatments. In order for doctors to select the appropriate treatment, they need to know the precise location of the cancer as well as the type of cell that has transformed into cancer. The rectum, which is the lower portion of the large intestine, is where the body stores waste from digestion (feces). The feces travel through the anal canal, which is a small tube that connects the rectum to the anal opening. Once the feces reach the anal opening, they are expelled through a bowel movement.
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