Synonyms:
a.k.a. hereditary brachial plexus neuropathy a.k.a. hereditary neuralgic amyotrophy HNA, rare:
Clinical features:
Usually Painless
Attacks of weakness with recovery over weeks +some cranial involvement
Genetics:
Mapped to chr. 17q24-25
Autosomal dominant
Findings on investigations:
NCS/EMG: may be normal between attacks
Pathology, nerve biopsy:
Semithin plastic sections: Tomacula (sausage like excess myelin)
Teased fibres: Tomacula (sausage like excess myelin)