Aims

Inflammatory neuropathies with pathogenic involvement of the nodes of Ranvier through autoantibodies have been increasingly characterized in the past years. The so-called anti-pan-NF-associated neuropathies caused by the simultaneous existence of anti-Neurofascin-186/-140 and -155-antibodies are extremely rare and cause life threating symptoms. Therapeutic strategies are needed as symptoms may be life-threatening and may not respond to standard first-line CIDP treatment.

Methods

We report a case of a 52-year-old male with a rare anti-pan-Neurofascin (NF) (-155, -186/-140)-associated neuropathy.

Results

The initial presentation was subacute with mild paresthesia leading to a fulminant “locked-in”-like syndrome requiring mechanical ventilation within the first eight weeks despite treatment with intravenous immunoglobulins. Nerve conduction studies revealed non-excitable nerves with acute spontaneous activity in electromyography. High titers of anti-Neurofascin-155, -186/-140-antibodies were detected in serum and cerebrospinal fluid. A combination of aggressive immunotherapy consisting of intravenous immunoglobulins, plasma exchange, Rituximab and Bortezomib resulted in clinical improvement with ambulation and non-detectable anti-Neurofascin-antibodies within the following three months. The follow-up nerve conduction studies showed normalized amplitudes of the peripheral nerves with signs of reinnervation in electromyography.

Conclusion

We conclude that an early aggressive immunotherapy consisting of a combination of Rituximab and Bortezomib could be considered as a therapeutic option for anti-pan-NF-associated neuropathies.

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