Premium
Primary cutaneous CD56 positive lymphoma: a diagnostic conundrum in an unusual case of lymphoma
Author(s) -
Schieke Stefan M.,
Sharaf Mohammed A.,
Lerner Adam,
Rünger Thomas M.,
Mahalingam Meera
Publication year - 2012
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/j.1600-0560.2012.01874.x
Subject(s) - cd43 , lymphoma , pathology , t cell lymphoma , medicine , peripheral t cell lymphoma , cd3 , biopsy , immunophenotyping , cutaneous lymphoma , mycosis fungoides , t cell , cd8 , antigen , immunology , cd20 , immune system
We present an unusual case of a CD56‐positive T‐cell lymphoma exhibiting immunophenotypic characteristics of both γδ T‐cell lymphoma and extranodal NK/T‐cell lymphoma, nasal‐type. The patient presented with a 2‐month history of rapidly progressive, pruritic and cutaneous nodules on his arms. A biopsy showed a dense pan‐dermal infiltrate of markedly atypical CD3‐positive lymphocytes, compatible with tumor stage cutaneous T‐cell lymphoma. Retrospective review of a preceding biopsy and flow cytometric analysis, performed at an outside institution, showed strong expression of surface CD3, CD7, CD43 and γδ T‐cell receptor (TCR), findings consistent with a diagnosis of cutaneous γδ T‐cell lymphoma. In light of these data, we performed additional studies that showed diffuse positive staining of the atypical lymphocytes for CD56, CD4 and CD43 as well as Epstein–Barr virus‐encoded small nonpolyadenylated RNA (EBER). Interestingly, this case displays characteristic features of γδ T‐cell lymphoma, with strong surface expression of CD3 and γδ‐TCR, as well as characteristics of natural killer (NK)/T‐cell lymphoma, including expression of CD4 and EBER positivity, that represent two separate categories in the current classification of cutaneous lymphomas. Taken together, these findings underscore the difficulty of rendering an unambiguous classification of the presented neoplasm given the close ontogenetic relationship between NK and cytotoxic T‐cells and highlight the need for continued reevaluation of the current classification system. Schieke SM, Sharaf MA, Lerner A, Rünger TM, Mahalingam M. Primary cutaneous CD56 positive lymphoma: a diagnostic conundrum in an unusual case of lymphoma.