MYOEPIELOMA 1901 NG UN Definition Myoepithelioma is a benign salivary gland tumour composed almost exclusively of sheets, islands or cords of cells with myoepithelial differentiation that may exhibit spindle, plasmacytoid epithelioid or clear cytoplasmic features 唾液腺肿瘤Definition • Myoepithelioma is a benign salivary gland tumour composed almost exclusively of sheets, islands or cords of cells with myoepithelial differentiation that may exhibit spindle, plasmacytoid, epithelioid or clear cytoplasmic features. 2 唾液腺肿瘤