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Monocytoid B cell lymphoma: A case report and evaluation

Lymphomas are a group of malignant blood cell tumors that develop from lymphocytes. Two main categories of lymphomas are Hodgkin and non-Hodgkin lymphomas (NHL), of which 90% are of the NHL type. The objectives of classifying is to help in the identification of homogenous group of well-defined entities and facilitating the recognition of uncommon diseases that further require classification as it affects prognosis and therapeutic implications. Nodal marginal zone lymphoma, also known as monocytoid B–cell lymphoma (MBCL), is an uncommon form of lymphoma representing 1.5%–1.8% of lymphoid neoplasms, with only rare reports in the literature that have attempted morphologic or immunophenotypic characterization. Specific markers for MBCLs are still lacking, so its diagnosis is based on exclusion of other small B-cell lymphomas. This article illustrates a case report of MBCL highlighting the intricacies and difficulties involved in establishing a diagnosis.