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Charcot-Marie-Tooth disease, type 4F (CMT4F) is a demyelinating CMT peripheral sensorimotor polyneuropathy. It is a rare form of CMT4 but the few reported families are from diverse ethnic groups: Lebanese Shiite Muslims, Hispanic North Americans, Northern Europeans and a Vietnamese family. Onset generally occurs in childhood but severity varies. Early onset with delayed motor milestones, and proximal and distal muscle weakness has been reported but a family in which the clinical picture was marked initially by sensory neuropathy has also been described. CMT4 is caused by mutations in the PRX gene (19q13.2). Transmitted in an autosomal recessive manner.
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