Sensory impairment in Friedreich's ataxia (FRDA) is generally accepted as being due to a ganglionopathy. The degree of contribution from axonal pathology remains a matter of debate. Nerve ultrasound may be able to differentiate these processes. The ultrasound cross-sectional area of median, ulnar, tibial and sural nerves of 8 patients with FRDA was compared with 8 age- and gender-matched healthy controls and with reference values in our population. The nerves of the patients with FRDA were significantly larger than healthy controls' at all upper limb sites (p
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