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King, Rebecca L.; Tan, Brent; Craig, Fiona E.; George, Tracy I.; Horny, Hans-Peter; Kelemen, Katalin; Orazi, Attilio; Reichard, Kaaren K.; Rimsza, Lisa M.; Wang, Sa A.; Zamo, Alberto und Quintanilla-Martinez, Leticia (2021): Reactive Eosinophil Proliferations in Tissue and the Lymphocytic Variant of Hypereosinophilic Syndrome 2019 Society for Hematopathology/European Association for Haematopathology Workshop Report. In: American Journal of Clinical Pathology, Bd. 155, Nr. 2: S. 211-238

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Abstract

Objectives: The 2019 Society for Hematopathology and European Association for Haematopathology Workshop reviewed the spectrum of neoplastic, nonneoplastic, and borderline entities associated with reactive eosinophilia in tissue. Methods: The workshop panel reviewed 46 cases covered in 2 workshop sessions. Results: The 46 cases were presented with their consensus diagnoses during the workshop. Reactive eosinophilia in lymph nodes and other tissues may be accompanied by or be distinct from peripheral blood eosinophilia. Reactive etiologies included inflammatory disorders such as Kimura disease and IgG4-related disease, which may show overlapping pathologic features and reactions to infectious agents and hypersensitivity (covered in a separate review). Hodgkin, T-cell, and B-cell lymphomas and histiocytic neoplasms can result in reactive eosinophilia. The spectrum of these diseases is discussed and illustrated through representative cases. Conclusions: Reactive eosinophilia in lymph nodes and tissues may be related to both nonneoplastic and neoplastic lymphoid proliferations and histiocytic and nonhematolymphoid processes. Understanding the differential diagnosis of reactive eosinophilia and the potential for overlapping clinical and pathologic findings is critical in reaching the correct diagnosis so that patients can be treated appropriately.

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