Myoepithelioma (myoepithelial carcinoma) of the breast: Case report

12021 Background: Myoepithelial carcinoma of the breast is a rare condition. Here, are 2 cases of malignant myoepithelial documented. Both were 51 year-old Kuwaiti women, presenting with abnormal breast masses. Methods: The first patient underwent mastectomy while the second patient underwent lumpectomy followed by mastectomy for narrow margins. The tumours were clinically, radiologically and macroscopically demarcated. Diagnosis was made based on histological and immunohistochemical studies. Results: Both cases were positive for α-smooth muscle actin, S-100ptn and one case was positive for Vimentin and the other case was positive for Epithelial Membranous Antigen (EMA). From these findings the cases were diagnosed with malignant Myoepithelioma. One case consisted microscopically of tumour cells with clear cytoplasm, possibly making it one of 3 reported cases of clear cell myoepithelial carcinoma. One case locally recurred and metastasized, while the other is still newly diagnosed and under follow-up. Con...