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The lymphoma classification used in this section is based on the Revised 4th Edition of the WHO Classification of Tumors of Hematopoietic and Lymphoid Tissues published in 2017. Some of the rare esoteric entities have not been mentioned since good examples are not available in my collection. The basic underlying principles are the same as those used in the Revised European American Lymphoma (REAL) classification published by the International Lymphoma Study Group in 1994. The neoplasms are divided into B-cell, T-cell, and NK-cell categories based on lineage. In addition, there is further subdivision into precursor lymphoid neoplasms and those derived from mature lymphoid cells.