In contrast to infectious meningitis, fever is often absent. Leptomeningeal involvement can occur in both lymphomas primary to the central nervous system (CNS) and in those secondarily invading the CNS. Lymphomas rarely begin in the leptomeninges. Presence of leptomeningeal involvement of the lymphoma may affect prognosis and treatment decisions.
C79.32 – Secondary malignant neoplasm of cerebral meninges
426128009 – Lymphomatous meningitis