title: Extramedullary plasmacytoma presenting as a primary mass in the breast. A case report.
abstract: BACKGROUND
  Extramedullary plasmacytoma (EMP) of the breast is extremely rare, especially that not associated with multiple myeloma.
  
  
  METHODS
  A case of plasmacytoma of the breast in a 73-year-old man was diagnosed by fine needle aspiration cytology (FNAC). Aspiration smears revealed a dispersed population of plasmacytoid cells at various stages of maturation. The tumor was excised, and the histologic sections confirmed the cytologic diagnosis.
  
  
  CONCLUSIONS
  FNAC diagnosis of plasmacytoma of the breast offers the opportunity to distinguish these neoplasms from primary mammary tumors and avoid unnecessary surgery.
authors.affiliation: Department of Pathology, Hospital General San Jorge, Avenida Martinez de Velasco, 36 22071-Huesca, Spain.
authors.forename: Jesús
authors.initials: J
authors.lastname: Vera-Alvarez
authors.forename: Miguel
authors.initials: M
authors.lastname: Marigil-Gómez
authors.forename: María Dolores
authors.initials: MD
authors.lastname: García-Prats
authors.forename: Manuel
authors.initials: M
authors.lastname: Abascal-Agorreta
authors.forename: José Ignacio
authors.initials: JI
authors.lastname: López-López
authors.forename: Javier
authors.initials: J
authors.lastname: Perez-Ruiz
mesh_terms: D000368:Aged; D000970:Antineoplastic Agents / Q000494:pharmacology; D014408:Biomarkers, Tumor / Q000378:metabolism; D044963:Biopsy, Fine-Needle; D019046:Bone Marrow Neoplasms / Q000473:pathology*; D018567:Breast Neoplasms, Male / Q000556:secondary*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008408:Mastectomy; D009101:Multiple Myeloma / Q000473:pathology; D010950:Plasma Cells / Q000473:pathology*; D010954:Plasmacytoma / Q000556:secondary*
chemical_list: D000970:Antineoplastic Agents; D014408:Biomarkers, Tumor