Although for a long time, the cause of<unk>  was not known, recent work has associated this problem with herpes simplex viruses, particularly HSV-2. Cases of<unk> 's resulting from varicella zoster virus infection, diagnosed by polymerase chain reaction (PCR), have been documented. In these cases, PCR for herpes simplex was negative. Some patients also report frequent shingles outbreaks. Varicella zoster virus, which causes chickenpox and shingles is part of the herpes family, and is sometimes called "herpes zoster virus". CNS epidermoid cysts (a type of cholesteatoma) can give rise to<unk>  especially with surgical manipulation of cyst contents. A familial association, where more than one family member had<unk> 's, has been documented.
Mollaret's meningitis
Rasmussen's encephalitis
La Crosse encephalitis
Fungal meningitis
Brain fever
Japanese encephalitis
Eastern equine encephalitis
Sappinia amoebic encephalitis