Hemophacial spasm is a facial movement disorder that consists of tannic and clannic involuntary movements of muscles observed by the facial nerve. In this patient's example, you can see movements around the eye, around the mentalis. And I think it's easiest to see that these movements particularly are clannic. Occasionally you'll see superimpuls tannic movements, particularly around the mouth. Here's another example of a patient's facial movements. Our secondary to a cerebellopantine angle up a dermoid tumor. The first patient was a sequely of a bell's palsy. Here you can see the movements around the bicularis muscles. And here movements around the mentalis. Although oftentimes this disorder is idiopathic, one should suspect compression of the seventh nerve, perhaps from a tumor or a dolicoectatic basilar artery. Other times it can be the sequely of trauma or a bell's palsy. Oftentimes, however, it's simply idiopathic.