Simultaneous Presentation of Relapsed Diffuse Large B-cell Lymphoma and Extrapulmonary Tuberculosis in a Patient With HIV: A Case Report.

Human immunodeficiency virus (HIV) infection is a strong risk factor for diffuse large B-cell lymphoma (DLBL) and tuberculosis. Both DLBCL and tuberculosis can have remarkably similar clinical presentations, proving to be a diagnostic and therapeutic challenge. We report the only known case of an HIV-infected individual who presented simultaneously with relapsed DLBCL in the form of spinal cord involvement and tuberculosis of the mesenteric lymph nodes. This case highlights the possibility of multiple co-existing diagnoses in HIV, and the need for a low threshold to obtain confirmation via biopsy. The interferon-gamma release assay (IGRA) has low sensitivity in detecting tuberculosis in patients with HIV. Adherence to antiretroviral therapy (ART) is crucial in achieving and maintaining remission in DLBCL.