A bulky tumor of the rectum exhibits a delicate, velvety, easily bleeding surface. It has no pedicel and its base appears to be as wide as its apex. The process is most probably:

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Villous adenomas are characterized by a delicate, velvety surface and can be sessile, meaning they have a broad base rather than a pedicel. They are prone to bleeding and are considered pre-malignant, potentially leading to adenocarcinomas if not removed.

A Bulky Tumor of the Rectum Exhibits a Delicate, Velvety