Symptoms usually begin in late-childhood or early adulthood. Usually, the initial symptom is foot drop due to involvement of the peroneal nerve, which is responsible from raising the feet, early in the course of the disease. Wasting of muscle tissue of the lower parts of the legs may give rise to "stork leg" appearance.
The diagnosis is established by electromyography examination (which shows that the velocity of nerve impulse conduction is decreased and the time required to charge the nerve is increased) and nerve biopsy. There is no treatment to replace the missing chemicals.
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