Types Anal cancer?

The forms of abnormal cell growth in the anus are anal intraepithelial neoplasia  (AIN) or anal squamous intraepithelial lesions (SILs). Tumors in or on the anus may be benign tumors (noncancerous) or malignant tumors (cancerous).

The different types of anal cancer, and where they show up, include:

• Squamous cell carcinoma, found in the outer lining of the anal canal
• Cacogenic carcinoma, found between the outer part of the anus and the lower part of the rectum
• Adenocarcinoma, found in mucus-producing glands beneath the anal lining
• Basal cell carcinoma, a skin cancer, found in the perianal skin around the anus.
• Melanoma, a skin cancer, found in pigment-producing cells in the skin or anal lining

Squamous cell carcinoma is the most common type of anal cancer. Carcinoma in situ, also called high-grade squamous intraepithelial lesions or Bowen disease, refers to precancerous cells found on the inner surface of the anus.

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