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Cite this page: Mansouri J. Adenoma (noncystic). PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/appendixadenoma.html. Accessed March 18th, 2019.
Definition / general
- Very rare; by definition, no features of true invasion
- Villous adenomas are also called low grade appendiceal mucinous neoplasms
- Cystic adenomas are called cystadenomas (see below)
- Sporadic, may be associated with colonic adenomas or familial adenomatous polyposis
Microscopic (histologic) description
- Resemble colonic tubular, villous or tubulovillous adenomas
- Cellular crowding, usually low grade dysplastic changes of nuclear elongation and stratification, pleomorphism and increased mitotic figures
- Also mucin depletion
- No invasion into appendiceal wall or high grade nuclear atypia
