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Histological analysis: (a) Intact rectal mucosa, and presence of mucinous adenocarcinoma (arrows) in the submucosa, suggesting extra-rectal mucosa origin (b) Perineal fistula tract in CSH area (arrow), showing mucinous adenocarcinoma near the fistula and extensive area of necrosis (c) Mucinous adenocarcinoma (arrows) near the perineal skin (squamous epithelium*) (d)Tumor area with mucinous production (arrows).
