High Grade Anal Canal Intraepithelial Neoplasia

**Semantic type:** Neoplastic Process

**Definition:** Intraepithelial neoplasia involving the anal canal. The epithelial cells exhibit moderate dysplasia (grade II intraepithelial neoplasia) or severe dysplasia (grade III intraepithelial neoplasia or carcinoma in situ).

**Synonyms:** - ASIN-H - High Grade Anal Canal Dysplasia - High Grade Anal Canal Squamous Dysplasia - High Grade Anal Canal Squamous Intraepithelial Neoplasia - High Grade Anal Squamous Intraepithelial Neoplasia