Gastrointestinal Manifestations of Mature B Cell Neoplasms: Single Center Experiences from the Collective Perspective of Hematology and Pathology

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Introduction: Hematological malignancies are frequently affecting the gastrointestinal (GI) tract, either by secondary extra nodal or extramedullary extension to the GI tract, or as a primary process arising in the GI tract. Gastrointestinal non-Hodgkin lymphomas (gNHL) appear less than other solid organ tumours in the GI tract. Therefore, in the absence of nodal or extra nodal involvement in imaging methods, there may be difficulties in diagnosis. Haematologists provide more important support by pathologists in terms of diagnosis than imaging methods.Methods: We retrospectively investigated all B-cell lymphoma patients diagnosed in our clinic between 01.01.2015- 01.01.2021. After that, patients not diagnosed by gastrointestinal system sampling were excluded from the study. Demographic data of these patients were obtained from the hospital information system and outpatient clinic files. Slides of these patients were obtained from pathology archive and re-evaluated under light microscope by two pathologists. All cases were diagnosed according to revised World Health Organization (WHO) 2017 classification.Results: 55 patients were diagnosed with B-cell lymphoma by sampling by endoscopy or colonoscopy. 40 of the patients were diagnosed with Diffuse Large B Cell Lymphoma (DLBCL), 10 with Marginal Zone Lymphoma (MZL), 2 with Mantle Cell Lymphoma (MCL), 2 patients with Burkitt Lymphoma (BL) and 1 patient with Lymphoplasmacytic Lymphoma (LPL).Conclusion: Like the literature, the frequency of DLBCL was the highest in patients diagnosed with GI tract in our study. The second most common B-cell lymphoma was MALToma. Although MCL is with a high frequency of GI involvement, there were few patients diagnosed with GI involvement. The reason for this was that the patients were diagnosed with nodal involvement rather than GI sampling.