Changes

A classical sign of Wilson’s disease, risus sardonicus is a form of facial dystonia producing a fixed smiling or grinning expression in the absence of any mirth or humor. It has been described as an “evil-looking” grin. This patient was a 27 year old man with a 10 year history of Wilson’s disease, who also had a [[Striatal Toe|striatal toe]]. Risus sardonicus also occurs in MSA, thalamic hemorrhage, tetanus and strychnine poisoning.