Brueghel syndrome: its distinction from Meige syndrome.

A critical historical evaluation of the cranial dystonias supports the separation of the dystonia of the motor trigeminal nerve producing a widely opened mouth (Brueghel syndrome) from the more common facial dystonias with blepharospasm (Meige syndrome). In a patient with Brueghel syndrome, paroxysmal hyperpnea coincided with dystonic gaping; the finding of upbeating nystagmus suggests pontine localization in the pathogenesis of this rare disorder.