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De novo salivary malignant myoepithelioma: pathologic diagnosis of 19 cases

, : De novo salivary malignant myoepithelioma: pathologic diagnosis of 19 cases. Zhonghua Kou Qiang Yi Xue Za Zhi 39(4): 287-290

To study the pathological characteristics of salivary malignant myoepithelioma with characteristic multinodular architecture. To observe the histologic and cytologic characteristics of 19 cases of de novo salivary malignant myoepithelioma with multinodular growth pattern. Immunohistochemistry of calponin, SMA, S-100, GFAP, cytokeratin, PCNA was done on 11 cases and ultrastructure was observed on 3 cases. 19 tumors presented characteristic multinodular growth pattern, mostly accompanied by central necrosis. Neoplastic nests invaded the surrounding normal tissue and tumor cells displayed a variety of pleomorphism. Epitheliod cell was the most predominant cell type. Tumor-related extracellular matrix formation was revealed among tumor cells. Immunohistochemical staining demonstrated that the tumor cells were positive for calponin, SMA, S-100, GFAP, AE1/AE3, CKH and PCNA. Myofilaments were found in neoplastic cell cytoplasm under the electron microscope. Histologic and cytologic observation, immunostaining and ultrastructural study all supported the myoepithelial and malignant nature of the tumor.


PMID: 15454011

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