Esophageal Squamous Intraepithelial Neoplasia

**Semantic type:** Neoplastic Process

**Definition:** A neoplastic process characterized by the presence of architectural abnormalities and dysplasia of the esophageal squamous epithelium. It is a pre-invasive lesion that is classified as low- or high- grade and has a significant risk of progression to invasive esophageal squamous cell carcinoma.

**Synonyms:** - Esophageal Squamous Dysplasia