Basaloid (Undifferentiated) Penile Intraepithelial Neoplasia

**Semantic type:** Neoplastic Process

**Definition:** Intraepithelial neoplasia of the penis characterized by full-thickness replacement of the squamous epithelium by immature, small, monotonous, basophilic cells. The cells have round to oval nuclei, inconspicuous nucleoli, and scant cytoplasm. Apoptosis and mitotic figures are prominent. (WHO 2016)

**Synonyms:** - Basaloid (Undifferentiated) PeIN - Basaloid PeIN - Basaloid Penile Intraepithelial Neoplasia