Primary Central Nervous System T- Cell Lymphoma of the Brain in An Immunocompetent Patient Primary central nervous system (PCNS) T-cell lymphoma is a rare disease and rarer if it is seen in immunocompetent patients. The PCNS lymphoma makes up 1-7% of primary brain tumors. PCNS T-cell lymphoma accounts for about 2% of all PCNS lymphoma and almost 99% are seen in immunocompromised patients (Latta et al 2010, Batchelor et al 2003). Here, we report a case of PCNS T-cell lymphoma in an elderly patient who is immunocompetent. The radiological findings, histopathological studies, and reviews of the current literature of this rare condition are discussed.