Epithelial Tumors of the Anal Canal Masahiro Takano 1 , Shunji Ogata 1 , Ryoichi Nozaki 1 , Tomohisa Ohwan 1 , Saburo Hisano 1 , Yasumitsu Saiki 1 , Mitsuko Fukunaga 1 , Shota Takano 1 , Masafumi Tanaka 1 , Shinichiro Magata 1 , Gentaro Sakata 1 , Kazuo Shirouzu 2 , Kazutaka Yamada 1 1Coloproctology Center, Takano Hospital, Kumamoto, Japan 2Department of Surgery, Kurume University School of Medicine, Kurume, Japan Keyword: 肛門部悪性腫瘍 , 肛門部前癌状態 , 肛門部腫瘍の病理 , 肛門部腫瘍の分類 , 肛門部腫瘍の発生 pp.1350-1358
Published Date 2010/7/25
DOI https://doi.org/10.11477/mf.1403101989
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 Although anal carcinoma is relatively rare, there are many histological types. The reason for this is that the anal canal is situated between the perianal skin and the rectum, which is covered with the anoderm composed of a mixture of various epithelia.

 In addition, there is the cloacogenic zone above the dentate line, originating from the cloaca, and there are the anal glands opening at the dentate line.

 In this paper we will describe the following nine types of anal carcinoma i.e., early anal carcinoma, fistulous cancer, fistulous cancer originating from Crohn's disease, adenosquamous carcinoma, basaloid carcinoma, basal cell carcinoma, extramammary Paget's disease,Bowen's disease, and malignant melanoma, along with their case reports.

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