Low Grade Squamous Intraepithelial Neoplasia

**Semantic type:** Neoplastic Process

**Definition:** A precancerous neoplastic process characterized by the presence of mild dysplastic cytological changes which are usually present in the lower part of the squamous epithelium. Representative examples include the low grade esophageal squamous intraepithelial neoplasia, low grade cervical squamous intraepithelial neoplasia, low grade vaginal intraepithelial neoplasia, and low grade vulvar intraepithelial neoplasia.

**Synonyms:** - Grade 1 Squamous Intraepithelial Neoplasia - Grade I Squamous Intraepithelial Neoplasia - LSIL - LSIL - Low-Grade Squamous Intraepithelial Lesion - Squamous intraepithelial neoplasia, grade I - Squamous intraepithelial neoplasia, low grade - low-grade squamous intraepithelial lesion