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| AuthorsArnold S Freedman, MDJon C Aster, MD | Section EditorAndrew Lister, MD, FRCP, FRCPath, FRCR | Deputy EditorRebecca F Connor, MD |
Topic Outline
INTRODUCTION
Diffuse large B cell lymphoma (DLBCL) is the most common histologic subtype of non-Hodgkin lymphoma (NHL) accounting for approximately 25 percent of NHL cases [1,2]. (See "Classification of the hematopoietic neoplasms".)
It is increasingly appreciated that the diagnostic category of "DLBCL" is quite heterogeneous in terms of morphology, genetics, and biologic behavior. A number of clinicopathologic entities are now recognized that are sufficiently distinct to be considered separate diagnostic categories:
Each of these is discussed separately in the sections that follow the general discussion of DLBCL, or in their own topics. In addition, the 2008 version of the World Health Organization (WHO) classification system provides two overlap categories termed [1]:
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