Definition: general term for ordinarily malignant neoplasms of lymphoid and reticuloendothelial tissues that present as apparently circumscribed solid tumors composed of cells that appear primitive or resemble lymphocytes, plasma cells, or histiocytes. Lymphomas appear most frequently in lymph nodes, spleen, or other normal sites of lymphoreticular cells; when disseminated, Lymphomas, especially of the lymphocytic type, may invade the peripheral blood and manifest as leukemia. Lymphomas are classified by cell type, degrees of differentiation, and nodular or diffuse pattern; Hodgkin disease and Burkitt lymphoma are special forms.
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