Zoster sine herpete, a clinical variant.

Two otherwise healthy immunocompetent men, ages 62 and 66 years, experienced years of radicular pain without zoster rash. An extensive search for systemic disease and malignancy was negative. Varicella-zoster virus DNA, but not herpes simplex virus DNA, was found in the cerebrospinal fluid of the first patient 5 months after the onset of pain, and in the second patient 8 months after the onset of pain. Prolonged radicular pain without zoster rash combined with the presence of varicella-zoster virus in the cerebrospinal fluid indicates that both men had zoster sine herpete, and strongly supports this syndrome as a clinical variant.