Herpes Zoster Radiculopathy in a Systemic Lupus Erythematosus Patient – A Case Report

Background: Motor neuropathy is an extremely rare herpes complication, with a mere prevalence of 0.5–5%. The case of segmental zoster paresis of limbs, resulting from motor radiculopathy, is especially limited, with cervical and thoracic segments being the least frequent. Setting: Neurology outpatient clinic. Case Description: We report a case of a 16-year-old female who presented sudden-onset right upper extremity weakness, a week after her herpes zoster lesions first appeared. As she was diagnosed with systemic lupus erythematosus (SLE) 4 months prior, she routinely consumed steroids and azathioprine. Initial examinations revealed multiple vesicles along right C5-C6 roots dermatome accompanied by upper right extremity weakness (manual muscle test [MMT] 3) corresponding to the myotome of C5-C6 roots. An electromyography assessment uncovered results relevant to motor root neuritis in C5-C6. Magnetic resonance imaging of the cervical radix with contrast showed no abnormality. Thus, she received acyclovir, gabapentin and physiotherapy. Results: A follow-up visit after 2 weeks revealed an improvement of the weakness along C5-C6 myotome (MMT 4). A month later, all motor functions were restored with hypoesthesia and hypoalgesia sensory sequelae along C5-C6 dermatome. Conclusion: Herpes zoster radiculopathy, though rare, can occur after the onset of characteristic rash. Since cellular-mediated immunity holds crucial roles in varicella zoster virus activation, SLE and immunosuppression therapy is pertinent to this rare motoric complication of herpes. The prognosis is good. Acyclovir, gabapentin and physiotherapy treatments resulted in satisfactory recovery.