M Ferreira Jr, BP Walcott, BV Nahed… - Journal of Neurosurgery, 2011 - thejns.org ... Hemifacialspasm is characterized by frequent involuntary muscle contractions of the unilateral face. 7 The origin of this disorder is attributed to the susceptibility of CN VII to compression by neighboring arteries at the RExZ. ... Related articles - All 2 versions