<unk>  is characterized by inflammation of the leptomeninges.<unk>  causes are divided to infectious and non-infectious processes. Infectious causes include bacterial, viral, fungal, protozoal and, treponemal. Non-infectious causes, such as systemic illnesses, may involve the CNS (e.g. neoplasms or connective tissue diseases). These causes can include sarcoidosis, systemic lupus erythematosus (SLE), and wegener's or certain drugs (e.g. nonsteroidal antiinflammatory drugs, intravenous immunoglobulin, intrathecal agents, and trimethoprim-sulfamethoxazole).The classic symptom triad of<unk>  is headache, neck stiffness, and fever.
Meningitis
Cerebritis
Encephalitis
Meningoencephalitis
Meninges
Meningism
Neoplastic meningitis
Lymphocytic choriomeningitis