[Hereditary amyotrophic neuralgia: two new cases].
We report clinical and electrophysiologic findings for two members of a family with a history of hereditary amyotrophic neuralgia, emphasizing the early onset in both patients, the great variation in symptoms within the same family and the poor functional evolution of one patient, who suffered significant functional sequelae at the age of 17 years in spite of not having suffered recurrences since age 5, and without having experienced either clinical or neurophysiological improvement during the intervening years.