Hepatitis E virus infection as a direct cause of neuralgic amyotrophy.

Introduction: We describe a patient who developed neuralgic amyotrophy (NA) related to hepatitis E virus (HEV) infection.

Methods: The patient underwent neurological and electrodiagnostic examinations, high-resolution analysis of serological changes, and HEV load profile, and was treated with intravenous immunoglobulin.

Results: There was evidence of bilateral, asymmetric acute inflammatory cervical polyradiculopathy and possible brachial plexopathy. Positive serum anti-HEV IgM was followed by seroconversion to anti-HEV IgG positivity. A calculated anti-HEV antibody index was compatible with intrathecal synthesis, and HEV genotype 3 RNA was found in serum and cerebrospinal fluid (CSF). Liver function tests returned to normal within 6 weeks.

Conclusions: Bilateral involvement of cervical nerve roots and/or plexus, elevated liver function tests, and abnormal CSF are typical features of HEV-associated NA. The pathogenesis involves possible immune-mediated mechanisms. However, our findings support the hypothesis that HEV-related NA is associated with direct infection. Muscle Nerve 54: 325-327, 2016.