part_of part of part of has_disease_location saliva-secreting gland salivary gland neoplasm Benign Salivary Gland Myoepithelioma NCIt:C5978 A rare benign tumor composed of sheets and islands of spindle, plasmacytoid, epithelioid, and clear cells that exhibit myoepithelial but not ductal differentiation. The average age of patients has been reported as 44 years. Clinically, these tumors present as asymptomatic masses. Discrimination between myoepithelioma and myoepithelial carcinoma is based primarily on the infiltrative growth of the latter.