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WHO Classification of Tumours
Classical Hodgkin lymphoma
Tumours of haematopoietic and lymphoid tissues


Definition

Classical Hodgkin lymphoma (CHL) is a monoclonal lymphoid neoplasm (in most instances derived from B cells) composed of mononuclear Hodgkin cells and multinucleated Reed-Sternberg (HRS) cells residing in an infiltrate containing a variable mixture of non-neoplastic small lymphocytes, eosinophils, neutrophils, histiocytes, plasma cells, fibroblasts and collagen ­fibres. Based on the characteristics of the reactive infiltrate and to a certain extent on the morphology of the HRS cells (i.e. lacunar cells), four histological subtypes have been distinguished: lymphocyte-rich classical Hodgkin lymphoma (LRCHL), nodular sclerosis classical Hodgkin lymphoma (NSCHL), mixed cellularity classical Hodgkin lymphoma (MCCHL) and lymphocyte-depleted classical Hodgkin lymphoma (LDCHL). The immunophenotypic and genetic ­features of the mononuclear and multinucleated cells are identical in these histological subtypes, whereas their clinical features and association with Epstein-Barr virus (EBV) show differences.

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Introduction: Hodgkin lymphomas