Abstract

A review and detailed analysis of the literature over the past two decades has revealed a unique ultrasound feature of pathologically "small" nerves in inherited sensory neuronopathies. Although sample sizes were limited, due to the rarity of these diseases, this characteristic ultrasound finding has been consistently reported across a variety of inherited diseases that affect the dorsal root ganglia. Direct comparisons with both acquired and inherited diseases that primarily affect the axons in the peripheral nerves showed that the ultrasound finding of abnormally "small" cross-sectional areas (CSAs) in mixed nerves of the upper limbs has a high diagnostic accuracy for inherited sensory neuronopathy. Based on this review, ultrasound CSA of the mixed upper limb nerves can be proposed as a marker for inherited sensory neuronopathy.

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