CD20-positive primary cutaneous extranodal NK/T-cell lymphoma

Abstract

Cutaneous extranodal NK/T-cell lymphoma, nasal type, and primary cutaneous g/d T-cell lymphoma (PCGD-TCL) are rare cutaneous lymphoid neoplasms with overlapping features. Although EBV positivity favors the former, EBV+ PCGD-TCL has recently been reported. They also share cytotoxic markers and a poor prognosis. Here we report an unusual case of cutaneous NK/T-cell lymphoma with overlapping features of PCGD-TCL in a 55-year-old man who also developed hemophagocytic lymphohistiocytosis. Although it presents the typical pathological and immunophenotypic features of a cutaneous NK/T-cell lymphoma and PCGD-TCL, it aberrantly expresses CD20, giving an impression of mixed populations of T cells and B cells that are commonly seen in reactive conditions. This rare case represents a diagnostic pitfall and intends to raise more awareness among both pathologists and dermatologists. The CD20 positivity may also provide a target for rituximab therapy.

Keywords

Cutaneous NK/T-cell lymphoma, primary cutaneous g/d T-cell lymphoma, hemophagocytic lymphohistiocytosis, CD20, rituximab

How to Cite

Xu, X. & Romero, L. & Kim, Y. & Zhao, X. F., (2017) “CD20-positive primary cutaneous extranodal NK/T-cell lymphoma”, Hematopathology 2(1), p.19-23.

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Authors

Xiangdong Xu (University of California San Diego)
Laura Romero (University of California San Diego)
Young Kim (City of Hope, Duarte, CA)
X. Frank Zhao (University of Arizona)

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Creative Commons Attribution-NonCommercial 4.0

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This article has been peer reviewed.

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