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Anal cancer is a cancer which arises from the anus, the distal opening of the gastrointestinal tract. [1] Symptoms may include bleeding from the anus or a lump near the anus. [ 1 ] Other symptoms may include pain, itchiness, or discharge from the anus. [ 1 ]
Diagram showing stage 4 anal cancer. Date: 30 July 2014 (released by CRUK) Source: Original email from CRUK: Author: Cancer Research UK: Permission (Reusing this file) This image has been released as part of an open knowledge project by Cancer Research UK. If re-used, attribute to Cancer Research UK / Wikimedia Commons
A perianal gland tumor is a type of tumor found near the anus in dogs that arises from specialized glandular tissue found in the perineum. [1] It is also known as a hepatoid tumor because of the similarity in cell shape to hepatocytes (liver cells). It is most commonly seen in intact dogs and is the third most common tumor type in intact male ...
A papillary hidradenoma, also termed hidradenoma papilliferum or mammary-like gland adenoma of the vulva, [1] is a rare, but nonetheless most common benign tumor that occurs in and between anal and genital regions (i.e. anogenital area) of females. [2]
Some types of human papillomavirus (HPV) can cause anal cancer. [2] Other HPV types cause anogenital warts. Cigarette smokers, men who have sex with men, individuals with a history of immunosuppression (such as in HIV infection) and women with a history of cervical, vaginal and vulval cancer are at increased risk of getting anal cancer. [3]
Anal carcinoma is much less common than colorectal cancer. The most common form is squamous cell carcinoma, followed by adenocarcinoma and melanoma. [29] SCC usually occurs in the anal canal, and more rarely on the anal margin. Anal margin SCC presents as a lesion with rolled, everted edges and central ulceration. [27]
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A squamous cell papilloma is a generally benign papilloma that arises from the stratified squamous epithelium of the skin, lip, oral cavity, tongue, pharynx, larynx, esophagus, cervix, vagina or anal canal.