Symptoms, which vary greatly among patients and usually develop during childhood, may include slow writhing, distorting muscle contractions of the limbs, face, or trunk, choreoathetosis (involuntary, purposeless jerky muscle movements), muscle rigidity (uncontrolled tightness of the muscles), spasticity (sudden, involuntary muscle spasms), ataxia (inability to coordinate movements), confusion, disorientation, seizures, stupor, and dementia. Other less common symptoms may include painful muscle spasms, dysphasia (difficulty speaking), mental retardation, facial grimacing, dysarthria (poorly articulated speech), and visual impairment.
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