Rare co-existence of multifocal myoepitheliosis with infiltrating ductal carcinoma of the breast

摘要

Lesions composed of myoepithelial cells are known to occur in salivary gland, but they are uncommon in the breast. These range from benign lesions, such as myoepithelioma, to malignancies, such as adenoid cystic carcinoma and myoepithelial carcinoma. The predominance myoepithelial cells mainly in the terminal duct-Iobular units (TDLUs) with formation of multifocal lesions is termed myoepitheliosis. In the breast, this condition has been reported previously with other benign lesions such as sclerosing adenosis.