Hallervorden-Spatz Disease: Characterized by dystonia (slow,
steady muscle contraction distorting limbs, neck, face, mouth, or trunk into
certain positions), muscular rigidity, and choreoathetosis. Muscle spasms
are present in more than 33% of patients affected with this rare
neurologic disorder. Other clinical features seen less often are dysarthria,
mental retardation, facial grimacing, dysphasia, muscle atrophy, and
seizures.