ABSTRACT
Spasmodic torticollis (ST) is the most common type of focal dystonia. It involves the muscles of the neck, and is therefore called ‘‘cervical dystonia.’’ As a result of abnormal involuntary contractions of the neck muscles, the head may be rotated, tilted, flexed, extended, or any combination of these postures. The movements may be quick, sustained, or patterned, and therefore may be associated with tremor.
