Meige syndrome: a clinical and EMG study.

2 patients showing oral-facial asymptomatic dyskinesia are reported. Clinically observed involuntary movements are the same as those described by Henry Meige in 1910 for the first time. An outstanding EMG feature is the recording of spontaneous potential bursts, both short and long in duration, that show synchronism when activity is registered from different facial muscles at the same time. Clinical and EMG data allow close comparison between involuntary movements in the course of Meige syndrome and idiopathic hemifacial spasm.