Columnar Trichoblastoma

**Semantic type:** Neoplastic Process

**Definition:** A benign adnexal tumor occurring in the face of young female subjects. It is characterized by the presence of epithelial neoplastic cells and keratinous cysts in a desmoplastic stroma.

**Synonyms:** - Desmoplastic Trichoepithelioma - Sclerosing Epithelial Hamartoma