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792 recto-anal cancers were excised for curative surgery during 34 years since 1946. At least a part of 154 cancers of them involved a part or the entire of anal canal. In 34 of 154 cancers the centers of lesions were situated within anal canal. We like to define them as anal cancer.<BR>Anal cancers show the varieties of histological pattern and have the possibility to spread through all of three different lymphatic flows of the rectum.<BR>The lower part of anal canal, a part below the dentate line, serves the strong basin to the lymphatics toward inguinal nodes. From the discussion on the prognoses of the cases with inguinal node metastases, it can be understood that inguinal node metastases have two different characters. One is that of metastatic deposit within the reach of radical surgery, and the other is that of recurrent lesion after radical surgery.
日本大腸肛門病学会の論文