Appendix High Grade Intraepithelial Neoplasia

**Semantic type:** Neoplastic Process

**Definition:** A precancerous intraepithelial neoplastic lesion that affects the appendix. It is characterized by the presence of moderate or severe dysplasia and complex architectural alterations of the mucosal epithelium. There is no evidence of invasion.

**Synonyms:** - Appendiceal High Grade Dysplasia - Appendiceal High Grade Intraepithelial Neoplasia - Appendix High Grade Dysplasia