Risus Sardonicus
Risus Sardonicus
Risus sardonicus ("sardonic smile") due to spasm of the facial musculature is a classic feature of the neuromuscular syndrome of tetanus, now exceptionally rarely seen in the developed nations. Risus sardonicus may also occur in the context of dystonia, more usually symptomatic (secondary) than idiopathic (primary) dystonia.
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