Neurological Manifestations of Varicella Zoster Workup
- Author: Wayne E Anderson, DO; Chief Editor: Karen L Roos, MD more...
Laboratory Studies
- In cases of typical zoster special laboratory studies are unnecessary.
- In cases of zoster sine herpete, DNA analysis by PCR appears more useful than the standard assays, especially for early diagnosis.
Imaging Studies
- Magnetic resonance imaging (MRI) may be used in cases of myelopathy or encephalopathy to exclude other etiologies.
- Carreau and colleagues visualized facial nerve lesions with enhanced MRI in peripheral facial palsy.
Other Tests
- Lumbar puncture: Because the inflammatory response involves the leptomeninges, cerebrospinal fluid (CSF) may show increased protein and a pleocytosis.
- Biopsy can provide definitive diagnosis but is seldom necessary.
Histologic Findings
Varicella-zoster virus is a DNA virus. The viral genome encodes approximately 70 proteins. Once activated at the spinal root or cranial nerve neurons, an inflammatory response occurs that also encompasses the leptomeninges. Both plasma cells and lymphocytes are noted. In at least one case of motor neuron involvement, lymphocytic infiltration and myelin breakdown were observed with preservation of axons.
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