Neuralgic amyotrophy (also know as Parsonage-Turner syndrome or brachial plexus neuritis) is a distinct peripheral nervous system disorder characterised by episodes (attacks) of extreme neuropathic pain and rapid multifocal weakness and atrophy in the upper limbs. Neuralgic amyotrophy has both an idiopathic and hereditary form, with similar clinical symptoms but generally an earlier age of onset and more episodes in the hereditary form. The current hypothesis is that the episodes are caused by an immune-mediated response to the brachial plexus. Recovery is slow, in months to years, and many patients are left with residual pain and decreased exercise tolerance of the affected limb(s). Anecdotal evidence suggests that corticosteroids may relieve pain or help improve functional recovery.
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