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Medical Definition of Leukosarcomatosis
1. An obsolete term for a condition characterised initially by numerous widespread nodules or masses of lymphosarcoma, and the subsequent presence of similar cells in the circulating blood as in leukosarcoma. Abnormal proliferation of one or more of the leukopoietic tissues; the term includes myelosis, certain forms of reticuloendotheliosis, and lymphadenosis. (05 Mar 2000)