title: Plasmacytoid myoepithelioma of the laryngeal region: a case report.
abstract: The first case of plasmacytoid myoepithelioma of the laryngeal region is presented. The tumor showed immunoreactivity for the S-100 protein, low molecular weight cytokeratin, and vimentin. Staining was negative with muscular actin and glial fibrillar acid protein. By electron microscopy the tumor cells showed abundant microfibrillar material, elongated densities resembling smooth muscle dense bodies, pinocytic vesicles, and replicated basal lamina. The myoepithelial nature of plasmacytoid tumors of the salivary gland has been questioned.
authors.affiliation: Department of Pathology, Hospital General Dr. Miguel Silva, Morelia Mich. Mexico.
authors.forename: F
authors.initials: F
authors.lastname: Martínez-Madrigal
authors.forename: H
authors.initials: H
authors.lastname: Santiago Payán
authors.forename: A
authors.initials: A
authors.lastname: Meneses
authors.forename: H
authors.initials: H
authors.lastname: Domínguez Malagón
authors.forename: M E
authors.initials: ME
authors.lastname: Rojas
mesh_terms: D005260:Female; D006801:Humans; D007822:Laryngeal Neoplasms / Q000737:chemistry / Q000473:pathology*; D008875:Middle Aged; D009208:Myoepithelioma / Q000737:chemistry / Q000473:pathology*; D009418:S100 Proteins / Q000032:analysis
chemical_list: D009418:S100 Proteins