?:definition
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An indolent, low-grade B-cell non-Hodgkin lymphoma that arises from the choroid, iris, or ciliary body. It is characterized by the presence of a diffuse infiltrate of small, round lymphocytes. Lymphoid follicles with germinal centers may be present. In the past these tumors were termed \'reactive lymphoid hyperplasia\'. Now they are considered low-grade B-cell lymphomas, most commonly extranodal marginal zone lymphomas of mucosa-associated lymphoid tissue.
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