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Rectum. Adenocarcinoma. Colorectal Carcinomas Are Among The Most Common Malignant Neoplasms. Adenocarcinomas Account For More Than 90% Of Colorectal Carcinomas. Glandular Differentiation Is Usually Easily Appreciated Appearing As Very Irregular Tubular Structures. The Epithelium Lacks Goblet Cells And Shows Signs Of Stratification In Some Zones