<prompt> Most common CNS neoplasm in HIV patient ?MeduloblastomaAstrocytomaPrimary CNS lymphomaEpendymoma  <response>: Ans. is c i.e., Primary CNS lymphoma o Primary CNS lymphoma accounts for 2 of extranodal lymphomas and 1 of intracranial tumors. o It is the most common CNS neoplasm in immunosuppressed patients, including those with AIDS and immunosuppression after transplantation. 