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Activated‐cytotoxic TCRαβ+CD4+ peripheral T‐cell lymphoma with hypodermal localization: Case report of a lymphoproliferative disorder probably evolved from the CD4+ cytotoxic T‐cell subpopulation
Author(s) -
Tomasini Dario M.,
Serio Giovanni,
Landoni Carlo,
Appio Lorena,
Crivelli Filippo,
Bregni Marco
Publication year - 2020
Publication title -
journal of cutaneous pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 75
eISSN - 1600-0560
pISSN - 0303-6987
DOI - 10.1111/cup.13590
Subject(s) - lymphoma , cytotoxic t cell , pathology , not otherwise specified , peripheral t cell lymphoma , t cell , medicine , t cell lymphoma , cd3 , biology , immunology , cd8 , antigen , immune system , biochemistry , in vitro
The World Health Organization (WHO) classification of hematopoietic and lymphoid tumors identifies distinctive subtypes of peripheral T‐cell lymphoma (PTCL), and, additionally, some PTCLs involving mostly extranodal sites like the skin. The difficulty of classifying PTCLs according to the normal stages of T‐cell differentiation and the lack of definitive diagnostic markers for most of the subtypes make the diagnosis of these diseases challenging. PTCL cases which do not fit into any of the specifically defined entities are categorized as PTCL not otherwise specified (PTCL‐NOS). PTCLs‐NOS represent less than 2% of the total cases of T‐cell lymphoma involving the skin. This article illustrates a case of a PTCL‐NOS in which tumor cells have an activated cytotoxic TCRαβ+CD3+CD4+CD56+ T‐cell phenotype and histopathologic features of subcutaneous panniculitis‐like T‐cell lymphoma, leading to a fatal outcome.