Primary central nervous system lymphoma: A diagnostic challenge in a young immunocompetent patient with limited resources.

Primary central nervous system lymphoma is a rare form of central nervous system malignancy. It predominantly affects immunocompromised individuals and the elderly population. Diffuse large B-cell lymphoma is the most common type. This case report presents a 35-year-old female patient presented with progressive difficulty maintaining balance, headaches, seizures, and blurry vision for 2 months. Physical examination was unremarkable except for sluggish bilateral pupillary reaction and lower extremity weakness. MRI revealed multiple bilateral intraaxial masses. Biopsy and immunohistochemistry confirmed diffuse large B-cell lymphoma, nongerminal center B-cell type. However, the diagnosis was delayed for 4 months. The delay in the diagnosis was caused by its atypical presentation, a surgical site infection, and limited resources, which led the patient to disregard the recommended treatment and leave the hospital against medical advice. Even in the absence of risk factors of primary central nervous system lymphoma, it should be considered as a differential in a young patient with neurologic symptoms and intraaxial mass. Minimally invasive biopsy techniques and readily available immunohistochemistry are essential for prompt diagnosis and guiding treatment.