Vasculitic neuropathy in rheumatoid disease and Sjögren syndrome.

Two patients with rheumatoid arthritis and one with Sjögren syndrome had a severe sensorimotor neuropathy preceding or up to 5 years after the onset of the disease. Electrophysiologic and sural nerve biopsy studies revealed an axonal neuropathy. Myelinated fibers were affected to a greater extent than unmyelinated axons. Peripheral nerve damage was related to occlusion of the vasa nervorum, since vasculitic involvement of epineurial vessels was observed in all patients. Despite the severity of the neuropathy, it may recover, because, compared with axons, Schwann cells are perhaps less vulnerable to ischemia.