primary central nervous system lymphoma (Monarch Disease Ontology term MONDO_0002571) is a non-Hodgkin or Hodgkin lymphoma that arises in the brain or spinal cord as a primary lesion. There is no evidence of lymphoma outside the central nervous system at the time of diagnosis. Also known as: CNS lymphoma, PCNSL, central nervous system lymphoma, lymphoma of central nervous system, malignant lymphomas of CNS, malignant lymphomas of the CNS, microglioma, primary CNS lymphoma.