Successful treatment of recurrent primary central nervous system lymphoma with high-dose methotrexate.

Primary central nervous system (CNS) lymphoma is a rare disease, usually resistant to therapy. In the case presented, a 51-year-old woman with documented primary cerebellar CNS lymphoma, lymphoplasmacytoid type, underwent surgical resection and whole brain irradiation and then recurred within the CNS. Treatment with 17 courses of high-dose methotrexate resulted in complete disappearance of the tumor and clearing of all neurologic signs and symptoms. She is now free of disease 12 months after beginning chemotherapy. The potential usefulness of systemic anti-metabolites for treatment of CNS lymphoma, primary or disseminated, is discussed.