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Lymphomatous infiltration of the kidney. Lymphomatous infiltration which can be seen alone or with other lesions in the kidney is common in patients with B-cell lymphoproliferative disorders. There is a dense patchy interstitial infiltration by monotonous small lymphocytes (hematoxylin and eosin). Immunohistochemical staining of this infiltrate was consistent with interstitial involvement by marginal zone lymphoma. Note the absence of tubulitis. Magnification, ×200.
