A neoplasm that arises from the glandular epithelium of the rectal mucosa. It is characterized by tubular and villous architectural patterns. The neoplastic glandular cells have dysplastic features. The disease is MONDO_0006395 (rectal tubulovillous adenoma). Also known as: Villotubular adenoma of rectum, Villotubular adenoma of the rectum, rectal Villotubular adenoma, tubulovillous adenoma of rectum, tubulovillous adenoma of the rectum.