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Lymphoma or hyperplasia of the reticuloendothelial tissue.


Reticuloendotheliosis can occur in birds (i.e. avian reticuloendotheliosis), which is caused by a reticuloendotheliosis virus (from a group of retrovirus). Reticuloendotheliosis in humans, e.g. leukemic reticuloendotheliosis, is a hereditary disorder of the reticuloendothelial system characterized by enlarged spleen (splenomegaly) and abnormally high number of hairy mononuclear cells in bone marrow, spleen, liver and peripheral blood.

See also: reticuloendothelial system