Sjögren's syndrome (SS) is an autoimmune epithelitis characterized by lymphocytic infiltration of exocrine glands and epithelia in multiple sites. One third of the patients present with peripheral nervous system involvement. We describe the case of a woman aged 62 affected by a peroneal nerve mononeuropathy with painful disturbances secondary to a prevalent involvement of small fibers as demonstrated by electrophysiological investigations and skin biopsy. Asymmetric peripheral nerve involvement is not uncommon in SS, though, to our knowledge, it has never been reported of a mononeuropathy involving primarily small fibers.
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