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WHO Classification of Tumours
Malignant myoepithelioma
Breast


Definition

Malignant myoepithelioma is an infiltrating neoplasm composed purely of
myoepithelial cells, which are predominantly spindled, show identifiable mitotic activity, but often lack significant atypia. The lesions are generally well defined and range in size from 1 to 21 cm. Nodular areas of hylinization may be present. Larger tumours may contain foci of necrosis and haemorrhage.
Malignant myoepithelioma occurs in adults of all age groups. Local recurrence or distant metastases may occur. Complete excision with uninvolved margins is recommended

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Tavassoli FA, Devilee P (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of the Breast and Female Genital Organs.
3rd Edition
IARC Press: Lyon 2003



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