Definition:
Reticuloendotheliosis is characterized by a lymphoma (or cancer that arises from the lymphocytes) of a part of the immune system known as the reticuloendothelial tissue.
Leukemic reticuloendotheliosis, also known as hairy cell leukemia, is the most common type of reticuloendotheliosis. In this form of chronic leukemia, the malignant B-lymphocytes are observed in the spleen, bone marrow, and peripheral blood. When analyzed under a microscope, the malignant cells appear to be covered with minute hair-like protrusions.
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