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/Objective Primary CNS DLBCL is a rare entity, with an incidence of less than 0.47 per 100,000, however, in immunocompromised patients, especially those with Human Immunodeficiency Virus (HIV-1) infection, the incidence increases dramatically to 2-6 percent. Here we present a case of multifocal DLBCL in a young 28-year-old homeless male with untreated AIDS and polysubstance abuse. Methods/Case Report He presented to the hospital with altered state of consciousness; a Computerized Tomography (CT) scan showed three ring-enhancing masses; one in the left fronto-temporal region, the largest in the left basal ganglia and the third in the cerebellum. The main lesion was biopsied and diagnosed as DLBCL. The patient developed aspiration pneumonia and demised from respiratory failure Results (if a Case Study enter NA) NA Conclusion Coronal sections of the brain revealed a large grey-tan, soft lesion of poorly defined, irregular borders located in the left basal ganglia that measured 5 x 4 x 4 cm, extended dorsally and laterally. A similar lesion was observed in the deep left cerebral hemisphere, affecting the temporal lobe and extending rostrally into the frontal lobe, but completely separate from the tumor in the basal ganglia. A third, much smaller lesion was found in the right cerebellar hemisphere. Histologically, the tumor was composed of sheets of atypical lymphoid cells with increased nuclear to cytoplasmic ratio, increased mitotic activity, and showed scattered areas of necrosis. In the peripheral areas, tumor cells were located in the Virchow Robin space, and in more central areas they have broken into the brain parenchyma. Tumor cells were positive for CD20 and CD79a, indicating their B-cell origin. Other markers positive by immunohistochemistry were PAX5, MUM1 and BCL6 and the Epstein-Barr Virus (EBV) latent membrane protein (LMP). Fluorescence In situ hybridization (FISH) corroborated the presence of Eptein-Barr encoded RNAs.

Multifocal Primary Central Nervous System (CNS) Diffuse Large B-Cell Lymphoma (DLBCL) in a Patient with Aquired Immunodeficiency Syndrome (AIDS)