Villous Adenoma : Gross
Image Description
Villous adenomas show slender finger-like processes on the surface in 75% or more of the tumor. This accounts for granular appearance often seen in gross specimens. Pure villous adenomas are quite uncommon and make up between 3% and 15% of all colonic adenomas. Villous architecture is more frequently seen as a component in Tubulovillous adenomas. The larger the adenoma, the greater the frequency of villous component. Villous adenomas tend to be large and have greater degree of dysplasia.
The image shows a large villous adenoma (10 cm) that showed only focal high-grade dysplasia and no invasion. The tumor was located in the ascending colon and was discovered incidentally on a follow-up abdominal CT scan in a 65 y/o male with history of skin melanoma.
Image courtesy of: Laura G. Pastrián MD, La Paz University Hospital, Madrid, Spain.
The image shows a large villous adenoma (10 cm) that showed only focal high-grade dysplasia and no invasion. The tumor was located in the ascending colon and was discovered incidentally on a follow-up abdominal CT scan in a 65 y/o male with history of skin melanoma.
Image courtesy of: Laura G. Pastrián MD, La Paz University Hospital, Madrid, Spain.