title: The Differential Diagnosis of Eosinophilia in Neoplastic Hematopathology.
abstract: Eosinophilia in the peripheral blood is classified as primary (clonal) hematologic neoplasms or secondary (nonclonal) disorders, associated with hematologic or nonhematologic disorders. This review focuses on the categories of hematolymphoid neoplasms recognized by the 2008 World Health Organization Classification of Tumours and Haematopoietic and Lymphoid Tissues that are characteristically associated with eosinophilia. We provide a systematic approach to the diagnosis of these neoplastic proliferations via morphologic, immunophenotypic, and molecular-based methodologies, and provide the clinical settings in which these hematolymphoid neoplasms occur. We discuss recommendations that eosinophilia working groups have published addressing some of the limitations of the current classification scheme.
authors.affiliation: Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, L235 MC 5324, Stanford, CA 94305, USA. Electronic address: ryancj@stanford.edu.
authors.forename: Ryan C
authors.initials: RC
authors.lastname: Johnson
authors.affiliation: Department of Pathology, University of New Mexico School of Medicine, 1 University of New Mexico, MSC08 4640, Albuquerque, NM 87131-0001, USA.
authors.forename: Tracy I
authors.initials: TI
authors.lastname: George
keywords: Chronic eosinophilic leukemia; Eosinophilia; FGFR1; Hypereosinophilic syndrome; KIT; Myeloproliferative neoplasms; PDGFRA; PDGFRB; Systemic mastocytosis