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biallelic mutation/expansion of the gene RFC1 has been described in association with a spectrum of manifestation ranging from isolate sensory neuro(no)pathy to a complex presentation as Cerebellar Ataxia with Neuropathy and Vestibular Areflexia Syndrome (CANVAS). Our aim was to define the frequency and characteristics of small fiber neuropathy (SFN) in RFC1-disease at different stages.