title: HIV-unrelated benign lymphoepithelial cyst of the parotid glands containing lymphoepithelial lesion--like structures: a report of 3 cases.
abstract: Benign lymphoepithelial cyst (BLC) of the salivary gland is uncommon. Among report of these lesions, there were no previous cases of lymphoepithelial lesion (LeL) in human immunodeficiency virus type-1 (HIV-1) unrelated BLC. This study reports 3 cases of HIV-unrelated BLC containing LeL-like structures. Pathologically, 3 lesions were characterized by cuboidal epithelial-lined, cystic spaces, numerous lymphoid follicles, and dense lymphoplasmacytoid infiltrate. Moreover, small lymphocytes invaded the epithelial clusters forming LeL-like structures. Histological findings of 3 lesions resembled marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue (MALT) type. However, staining with CD3, CD5, and CD20 demonstrated the mixed nature of small lymphocytes invading the epithelial clusters (LeLlike structures). Moreover, there were no CD43+ B-lymphocytes in any of the cases. The polytypic nature of B-lymphocytes was demonstrated by immunohistochemistry and polymerase chain reaction. The 3 cases indicate that HIV-unrelated BLC should be added to the differential diagnosis of MALT-type lymphoma involving the parotid glands.
authors.affiliation: Department of Pathology and Clinical Laboratories, Gunma Cancer Center Hospital, Takbayashinishi-cho, Ohta, Japan. mkojima@gunma-cc.jp
authors.forename: Masaru
authors.initials: M
authors.lastname: Kojima
authors.forename: Naoya
authors.initials: N
authors.lastname: Nakamura
authors.forename: Hazuki
authors.initials: H
authors.lastname: Matsuda
authors.forename: Sadayuki
authors.initials: S
authors.lastname: Kaba
authors.forename: Hideaki
authors.initials: H
authors.lastname: Itoh
authors.forename: Nobuhide
authors.initials: N
authors.lastname: Masawa
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000378:metabolism; D003560:Cysts / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D003937:Diagnosis, Differential; D004847:Epithelial Cells / Q000378:metabolism / Q000473:pathology*; D005260:Female; D015658:HIV Infections / Q000473:pathology; D006801:Humans; D008214:Lymphocytes / Q000378:metabolism / Q000473:pathology*; D018442:Lymphoma, B-Cell, Marginal Zone / Q000175:diagnosis; D008232:Lymphoproliferative Disorders / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D010305:Parotid Diseases / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D010306:Parotid Gland / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D016896:Treatment Outcome
chemical_list: D015415:Biomarkers