Rectal Cancer Treatment (Professional) (cont.)
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Cellular Classification and Pathology of Rectal Cancer
The World Health Organization (WHO) classification of tumors of the colon and rectum include the following:
Intraepithelial neoplasia (dysplasia) associated with chronic inflammatory diseases
Carcinoid (well-differentiated neuroendocrine neoplasm)
Adenocarcinomas account for the vast majority of rectal cancers. Other histologic types of colorectal cancer account for an estimated 2% to 5% of colorectal tumors.
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