See also : [[Human Papillomavirus]]<br>
Anal cancer is a type of cancer which arises from the anus, the distal orifice of the gastrointestinal tract. It is a distinct entity from the more common [[Colorectal Cancer]]. The etiology, risk factors, clinical progression, staging, and treatment are all different. Anal cancer is typically a squamous cell carcinoma that arises near the squamocolumnar junction. It may be keratinizing (basaloid) or non-keratinizing (cloacogenic). Other types of anal carcinoma are adenocarcinoma, lymphoma, sarcoma or melanoma. An estimated 90% (27,400) were attributable to [[Human Papillomavirus]] (HPV).
== Symptoms ==