CLEAR-CELL MAMMARY MALIGNANT MYOEPITHELIOMA WITH ABUNDANT GLYCOGENS

Malignant myoepithelioma (myoepithelial carcinoma) of the breast is ex tremely rare. A case is reported of a 46 year old female with clear ce ll mammary malignant myoepithelioma that, on histological examination, was glycogen abundant clear cell carcinoma. Immunohistochemically, th e clear cells showed myoepithelial differentiation-that is, they were alpha smooth muscle actin and S100 protein positive. This case shows t hat glycogen abundant clear cell carcinoma is a variant of malignant m yoepithelioma of the breast.