Reviewer: Jaleh Mansouri, M.D. (see Reviewers page)
Revised: 19 October 2012, last major update August 2012
Copyright: (c) 2003-2012, PathologyOutlines.com, Inc.
● 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
● 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
Villous type adenoma
Low grade mucinous tumor with villous architecture
End of Appendix > Benign tumors > Adenoma (noncystic)
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