Copyright: © 2013 Niermann C, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. For the modern evidence based medicine classification systems are necessary to guarantee a unifying approach for therapy and for prognosis of diseases. The comparability of clinical studies depends of the usage of adequate classification systems. But because all classifications are artificial, they only mirror the technical possibilities of its area. This review discusses the history of lymphoma classifications systems with a special focus on the topic of primary cutaneous lymphomas and the retikuloendothelial system. Furthermore special problems in terminology are discussed. clinical behavior and prognosis than histologically, cytomorphologically and immunohistochemically identical secondary cutaneous and nodal lymphomas [13]. However, for years the B-cell lymphomas in particula
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