Abstract
Myoepithelioma was found in the left nasal cavity of a 67 year-old woman who presented with an expanding tumor, accompanied by episodes of epistaxis. The tumor was found to arise from the nasal septum and was surgically extirpated. The tumor was studied by light and electron microscopy, including immunohistochemical staining. By light microscopy, the tumor appeared to be a poorly differentiated epithelial neoplasm of undetermined origin; however, immunohistochemical examination and electron microscopic study showed plasmacytoid type myoepithelial differentiation indicative of a nasal gland origin.
