Type : Other, mainly phenotypes with suspected mendelian basis;
Description : Hemifacial spasm is usually diagnosed in persons in their mid-forties. It often begins
with involuntary clonic contractions or twitching of the orbicularis oculi muscle
and progresses to involve the entire musculature innervated by the facial nerve (summary
by Coad et al., 1991 and Miwa et al., 2002).;