Hairy Cell Leukemia

**Semantic type:** Neoplastic Process

**Definition:** A neoplasm of small B-lymphocytes with "hairy" projections in bone marrow, spleen, and peripheral blood. Most patients present with splenomegaly and pancytopenia. (WHO, 2001)

**Synonyms:** - HCL - Hairy cell leukemia - Hairy cell leukemia - Leukemic Reticuloendotheliosis - Leukemic reticuloendotheliosis - hairy cell leukemia