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A 68-year-old man with sensory ataxic dominant neuropathy associated with polyarteritis nodosa (PAN) had deep sensory disturbance with unsteady gait and absence of the Achilles tendon reflex. Examination revealed weight loss, elevated CRPlevel, negative antineutrophil cytoplasm antibodies, decreased M-waveamplitude in the peroneal motor nerve and absence of action potentials in the sural sensory nerve. Sural nerve biopsy revealed a marked loss of myelinated fibers, myelin ovoid formation anddoi:10.2169/internalmedicine.39.847 fatcat:y26is64ynzbmnfuay36tq3l4ru