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T- and NK-Cell Lymphomas and Systemic Lymphoproliferative Disorders and the Immunodeficiency Setting 2015 SH/EAHP Workshop Report-Part 4

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T- and NK-Cell Lymphomas and Systemic Lymphoproliferative Disorders and the Immunodeficiency Setting 2015 SH/EAHP Workshop Report-Part 4 AMERICAN JOURNAL OF CLINICAL PATHOLOGY Gratzinger, D., De Jong, D., Jaffe, E. S., Chadburn, A., Chan, J. K., Goodlad, J. R., Said, J., Natkunam, Y. 2017; 147 (2): 188-203

Abstract

The 2015 Workshop of the Society for Hematopathology/European Association for Haematopathology aimed to review immunodeficiency-related T- and natural killer (NK)-cell lymphoproliferations.The Workshop Panel reviewed 88 T- or NK-cell lymphoproliferations and rendered consensus diagnoses.Hyperplasias of T-cell subsets may be clonal; retained architecture and the clinical setting support a benign diagnosis. Specific associations include hepatosplenic T-cell lymphoma with iatrogenic immunosuppression and breast implants with an indolent variant of anaplastic large cell lymphoma. Epstein-Barr virus (EBV)-positive?T-cell lymphomas rarely occur in the acquired immunodeficiency setting. Systemic T- and NK-cell lymphoma of childhood overlaps with chronic active EBV and reversible hemophagocytic lymphohistiocytosis-related T-cell lymphoproliferations.Immunodeficiencies predispose to T-cell hyperplasias, which must not be overdiagnosed as lymphoma. Many T-cell lymphomas in the immunodeficiency setting are likely coincidental, with specific exceptions. Systemic T- or NK-cell lymphomas are part of a spectrum of EBV+?T or NK lymphoproliferations and can present in the acquired immunodeficiency setting.

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