title: Nasal T-cell lymphoma.
abstract: Nasal T-cell lymphomas represent a controversial subset of malignant lymphomas and include lesions previously termed midline malignant reticulosis, lymphomatoid granulomatosis, and polymorphic reticulosis. Nasal T-cell lymphomas are rare in Western populations and much more prevalent in Asian countries. Clinically, adult males are most often affected. Histologically, an angiocentric infiltrate composed of a spectrum of atypical cells is usually present. Phenotypically, the neoplastic cells lack expression of B-lineage markers, and usually express the T-lineage-associated markers CD2, CD45RO, and CD43; however, they often lack other pan-T-lineage markers. They often express the natural killer marker CD56, but usually lack the natural killer markers CD16 and CD57. Gene rearrangement studies have shown a germline configuration for the antigen receptor genes in the majority of cases. To date, evidence of Epstein-Barr virus has been consistently demonstrated, regardless of the geographic region studied. In situ hybridization studies have localized the Epstein-Barr virus to the atypical cells.
authors.affiliation: Division of Pathology, City of Hope National Medical Center, Duarte, California.
authors.forename: L M
authors.initials: LM
authors.lastname: Weiss
authors.forename: D A
authors.initials: DA
authors.lastname: Arber
authors.forename: J G
authors.initials: JG
authors.lastname: Strickler
mesh_terms: D005260:Female; D006801:Humans; D015994:Incidence; D016399:Lymphoma, T-Cell / Q000453:epidemiology / Q000235:genetics / Q000473:pathology / Q000628:therapy; D008297:Male; D009669:Nose Neoplasms / Q000453:epidemiology / Q000235:genetics / Q000473:pathology / Q000628:therapy; D015995:Prevalence