[Foix-Chavany's syndrome: clinical and electrophysiological study of 1 atypical case (author's transl)].

An atypical case of "Foix-Chavany syndrome", is described. A definite diagnosis could be achieved through an electromyographic and reflessological investigation (jaw reflex, blink reflex, perioral reflex), when a poor clinical history was not helping towards a definite diagnostic conclusion. It is proposed that the diagnosis of "Foix-Chavany syndrome" should not be limited only to classical "facial diplegia of cortical origin" or to "facio-linguo-pharyngo-laryngo-masseter paralysis of cortico-subcortical origin". Considering the great clinical variability of a syndrome with a common anatomical substrate, it is proposed to use the eponym for all syndromes characterized by: 1) a motor deficit in the cephalic district with relative integrity of motor function of the limbs; 2) a dissociation between loss of voluntary motility and preservation of reflex and automatic motility.