Charcot–Marie–Tooth disease
In common with other types of Charcot–Marie–Tooth disease, neurological examination reveals decreased nerve conduction velocity and histologic features of a hypertrophic demyelinating neuropathy. Electromyography shows signs of mild neurogenic damage while nerve biopsy shows onion bulb formations; the appearance of these formations is what primarily led Gustave Roussy and Gabrielle Lévy, the scientists who first described the disorder, to classify it as a variant of Charcot–Marie–Tooth disease.