Epithelial Hepatoblastoma

**Semantic type:** Neoplastic Process

**Definition:** A subtype of hepatoblastoma characterized by the presence of an epithelial component and absence of mesenchymal elements. It includes hepatoblastoma with pure fetal epithelial differentiation, hepatoblastoma with combined fetal and embryonal epithelial differentiation, macrotrabecular hepatoblastoma, and small cell undifferentiated hepatoblastoma (small cell undifferentiated hepatoblastoma with loss of INI1 nuclear staining should be classified as rhabdoid tumor).