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Definition of Terms The term histiocyte refers to a bone marrow–derived progenitor cell that differentiates, depending on the cytokine and growth factor milieu, into a dendritic antigen-presenting cell (Langerhans cell, dermal dendrocyte) or a phagocytic cell (tissue macrophage). Histologic subclassification…

Cutaneous Lymphomas and Pseudolymphomas This chapter deals primarily with primary cutaneous B- and T-cell lymphomas, that is, lymphomas that initially or primarily affect the skin, and reactive lymphoid infiltrates, which may simulate a lymphoma (pseudolymphoma). Later sections of this chapter…