Primary central nervous system T-cell lymphoma. Case report. Primary central nervous system (CNS) T-cell lymphoma is extremely rare. The present case report provides immunocytochemical evidence for a cerebellar CNS T-cell lymphoma. The patient underwent surgery followed by radiation therapy and is alive and well 36 months postoperatively. The clinical and pathological features of primary CNS T-cell lymphoma as well as diagnostic measures and treatment options are discussed, together with a compilation of all previous case reports of primary CNS T-cell lymphomas. 