NCIt definition : An exceedingly rare variant of Ewing sarcoma with epithelial differentiation that
resembles carcinoma and arises from the major salivary glands. Morphologically, it
is characterized by the presence of nests of basaloid cells, tumor cell palisading,
myxoid or hyalinized stroma, focal keratin pearl formation, and high-grade features
with minimal pleomorphism.;