Salivary Gland Polymorphous Adenocarcinoma, Conventional Subtype

**Semantic type:** Neoplastic Process

**Definition:** A salivary gland polymorphous adenocarcinoma characterized by the presence of uniform malignant cells with scant cytoplasm forming trabecular, tubular, microcystic, solid, and papillary-cystic patterns. The tumor stroma can be mucinous, myxoid, or hyalinized. Perineural involvement is often seen.