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.
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Famous quotes containing the word cancer:
“We “need” cancer because, by the very fact of its incurability, it makes all other diseases, however virulent, not cancer.”
—Gilbert Adair, British author, critic. “Under the Sign of Cancer,” Myths and Memories (1986)