Laboratory Studies
Systemic manifestations are uncommon and usually are confined to patients in whom the immune system has been compromised by other disease processes or chemotherapy. General laboratory studies and other systemic workup are not indicated unless complications or underlying diseases are suggested. A small percentage of patients, particularly those with CN involvement, may develop headache and neck stiffness, necessitating a spinal tap to exclude meningitis.
Occasionally, Tzanck preparation, viral culture, direct fluorescence antibody (DFA) testing, and/or skin biopsy may be necessary to establish the diagnosis in atypical cases. DFA testing is more sensitive than conventional viral cultures because of the lability of varicella-zoster virus (VZV).
Zoster is seen approximately 7 times more frequently in patients infected by human immunodeficiency virus (HIV); therefore, when clinically indicated, order an HIV test.
Zoster occasionally is considered a harbinger of other occult disease, particularly malignancies in older patients. Studies in hospitalized populations show an increased incidence of zoster in patients with cancer, particularly those of the lymphoreticular system. However, prospective studies on nonhospitalized patients have not demonstrated any difference in incidence between patients with malignancies and those without. Both zoster and malignancy are common in elderly individuals; therefore, most experts currently consider the association to be purely coincidental.
Histologic Findings
Clinical diagnosis almost always can be made. Biopsy is reserved for cases difficult to diagnose. On rare occasions when biopsy is necessary, histologic findings are similar to those of herpes simplex and varicella (chickenpox). Ballooning degeneration and acantholysis of keratinocytes result in an intraepidermal vesicle. Multinucleated giant cells with accentuation of nuclear material at the periphery of nuclei are characteristic. Underlying leukocytoclastic vasculitis often is a prominent finding and helps differentiate zoster from other herpetic infections.
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