Epithelial-myoepithelial carcinoma; An unusual tumor of the paranasal sinus

A 65-year old woman presented with nasal obstruction and on examination was found to have a huge mass in the maxillary sinus, This was removed, and hi stological examination revealed a mixture of trabecular structures consisti ng of inner dark cells, outer clear cells and solid structures consisting o f only clear cells. Immunohistochemical examination showed the clear cells to be positive for alpha-smooth muscle actin, Ultrastructural examination c onfirmed the myoepithelial cell origin. The characteristic morphological, i mmunohistochemical and ultrastructural features aided in the diagnosis of e pithelial-myoepithelial carcinoma.