title: [Extramedullary anaplastic plasmacytoma].
abstract: A case of extramedullary plasmacytoma of the maxillary sinus, locally aggressive, in a 65 years old man is presented. Clinical diagnosis of adenocarcinoma was suspected but the pathological study showed an anaplastic morphology, with little plasmacytic differentiation and lack of stain with cytokeratins and epithelial membrane antigen (EMA), immunohistochemical marker of plasmatic cells, among others. Definitive diagnosis was based on light chain restriction and lack of multiple myeloma.
authors.affiliation: Servicio de Anatomía Patológica, Hospital Central de Asturias (Hospital Covadonga), Universidad de Oviedo.
authors.forename: M
authors.initials: M
authors.lastname: Veiga González
authors.forename: M F
authors.initials: MF
authors.lastname: Fresno Forcelledo
authors.forename: M J
authors.initials: MJ
authors.lastname: Pérez del Río
authors.forename: B
authors.initials: B
authors.lastname: Madrigal Rubiales
authors.forename: A
authors.initials: A
authors.lastname: Vara Castrodeza
authors.forename: A
authors.initials: A
authors.lastname: Herrero Zapatero
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology; D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008444:Maxillary Sinus Neoplasms / Q000378:metabolism / Q000473:pathology*; D018396:Mucin-1 / Q000378:metabolism; D010954:Plasmacytoma / Q000378:metabolism / Q000473:pathology*
chemical_list: D018396:Mucin-1
vernacular_title: Plasmocitoma anaplásico extramedular.