<prompt> Which is the most common type of primary CNS lymphoma in AIDS Positive patients?Centroblastic large cell lymphomaImmunoblastic Large cell lymphomaAnaplastic B- Cell LymphomaLymphoplasmacytic Lymphoma  <response>: Primary CNS lymphoma -Immunocompetent patients is diffuse large B cell LymphomaDLBCL -Immune deficient patients with HIV infected or organ transplant recipients on immunosuppression is Immunoblastic Large cell lymphomaILCL Immunoblastic lymphoma is one of 3 morphologic variants of diffuse large B cell lymphoma DLBCL: Centroblastic lymphoma Anaplastic B-cell lymphoma. Immunoblastic Large cell lymphoma 