title: Lymphoepithelioid cellular lymphoma (Lennert's lymphoma) in association with malignant lymphoma, histiocytic type.
abstract: The present case is unusual in that it demonstrates the presence of the histologic pattern of Lennert's lymphoma in a patient who had a 14-year history of recurrent reticulum cell sarcoma (histiocytic lymphoma). This particular lesion also exhibits clinical and pathologic similarities to angioimmunoblastic lymphadenopathy and malignant lymphoma of peripheral T-lymphocyte origin. Whether the appearance of Lennert's lymphoma in this patient represents a regression of the previous reticulum cell sarcoma (histiocytic lymphoma) to a more benign form, a response to therapy, an alteration in the immune system, or a new lymphoreticular malignancy remains to be answered.
mesh_terms: D000368:Aged; D006644:Histiocytes / Q000473:pathology / Q000648:ultrastructure; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D008223:Lymphoma / Q000276:immunology / Q000473:pathology*; D016403:Lymphoma, Large B-Cell, Diffuse / Q000473:pathology* / Q000648:ultrastructure; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D013601:T-Lymphocytes