Painful Brachial Plexopathies in SEPT9Mutations Adverse Outcome Related to Comorbid States

Hereditary neuralgic amyotrophy (HNA), an autosomal dominant disorder associated with SEPT9mutation located on chromosome 17q25, causes recurrent painful weakness with sensory disturbances in a brachial distribution. We present electrophysiological, clinical phenotype, and molecular genetic data of three members from a family with HNA with the C262T SEPT9mutation. The degree of motor weakness and recovery is variable within this family. Severity and recovery from motor deficits may have been a function of comorbid medical conditions. To our knowledge, this is the first report to confirm SEPT9mutation in a family with suspected HNA.