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Background: Herpes zoster is a viral disease characterized by a painful skin rash with blisters in a limited area on one side of the body, often in a stripe. Central nervous system(CNS) involvements are uncommon complications of herpes zoster. The exact mechanism and risk factors are still unknown. Methods: We retrospectively reviewed the clinical data of patients who was admitted at our hospital due to herpes zoster from 2003 to 2013. The patients under age 15, herpes zoster infection without skin lesions, and cases not confirmed by a dermatologist were excluded. CNS involvements are defined as meningitis, encephalitis, single or multiple cranial neuropathies and all cases were evaluated with brain magnetic resonance imaging, spinal tapping, serological tests and confirmed by a neurologist. We compared the herpes zoster patients with CNS involvement to those without CNS involvement. Age, sex, body mass index, associated chronic medical illnesses, site and extent of skin lesion and development of post herpetic neuralgia were compared between two groups. Results: Total 1,131 subjects (male 460, female 671) were recruited. A group with CNS involvement was 91(8.04%). Sex, body mass index, associated chronic medical illnesses, extent of skin lesion were not different between two groups. A group with CNS involvement showed younger age(p<0.01), more facial and cervical skin lesions(p<0.01), lesser development of post herpetic neuralgia(p=0.048). Conclusions: CNS involvement is not a rare complication of herpes zoster and more frequent in patients with younger age and faciocervical zoster. J Korean Neurol Assoc 33(1):13-17, 2015

Determinants of Central Nervous System Involvement in Herpes Zoster