TNFRSF8 and T-cell non-Hodgkin lymphoma: Primary lymphoma in the central nervous system is rare, with an incidence of about 1/100,000.[1] T-cell lymphoma accounts for <20% of all cases, which is also designated as a rare occurrence.[2,3] Anaplastic large cell lymphoma (ALCL) is a type of T-cell lymphoma expressing CD30.