[The clinico-microbiological diagnosis of encephalitis due to herpes zoster in an elderly patient: apropos a case].

Varicella-zoster infection consists of well-recognized cutaneous manifestations. However, in several cases it is complicated with central nervous system disorders. We present a 79-year-old diabetic woman with zoster ophthalmicus, who developed an acute confusional syndrome. EEG, cranial computed tomographic, biochemical and haematologic and liquoral studies were performed. An increased in the CSF-IgG index was founded, and it was related with Varicella-Zoster Herpes antibodies. She was treated with intravenous acyclovir, and her encephalopathy was resolved.