Monarch Disease Ontology entry MONDO_0006187 (duodenal villous adenoma) is a neoplasm that arises from the glandular epithelium of the duodenum. It is characterized by a villous architectural pattern. The neoplastic glandular cells have dysplastic features. Also known as: duodenum villous adenoma, villous adenoma of duodenum, villous adenoma of the duodenum, villous adenoma, duodenum.