<prompt> All of the following are true about Primary CNS Lymphoma except:Most common type in immunocompetent patients is DLBCLGlucocoicoids should be given before biopsy to reduce the risk of edemaStereotactic biopsy is necessary for histologic diagnosisHigh-dose methotrexate is used for the treatment  <response>: PCNSL: Has increased incidence in immunocompromised patients Most common type in immunocompetent patients is DLBCL Lymphoma anywhere in the body- Biopsy is needed for diagnosis In PCNL - Stereotactic biopsy is necessary for histologic diagnosis Steroids are CI as they have cytolytic effect on tumor PCNL is also known as Ghost tumor - tumor disappear if given steroids Treatment: Chemotherapy - high dose Methotrexate 