The varied clinical expressions of dystonia.

This article describes the myriad clinical appearances of dystonic movements. The phenomenology of the movements varies according to the region of the body affected, but even within the same region there is a wide variation. Arguments were presented that dystonic movements consists of both slow, sustained contractions, and rapid, repetitive, twisting movements, especially in the earlier stages of the disease called "dystonia musculorum deformans," also known as primary torsion dystonia.