From: Low-grade appendiceal mucinous neoplasm and endometriosis of the appendix
Terminology | Defining factors | Secondary defining factors |
---|---|---|
Adenoma | Tubulor, tubulovillous, or villous adenoma with low- to high-grade dysplasia | |
Low-grade appendiceal mucinous adenoma | Mucinous neoplasm with low-grade cytologic atypia | Presence of ≥ 1 of the following: |
-Submucosa fibrosis | ||
-Loss of muscularis mucosae | ||
-Diverticulum-like growth through appendiceal wall | ||
-Dissection of acellular mucin | ||
-Mucin outside the appendix | ||
-Appendiceal rupture | ||
Mucinous adenocarcinoma | Mucinous neoplasm with evidence of cellular invasion past the epithelial layer |