Clinical and genetic features of cervical dystonia in a large multicenter cohort

Cervical dystonia (CD) is the most common adult-onset isolated dystonia.1,2 The percentage of patients with CD with head tremor, neuropsychiatric comorbidities, and spread of dystonia to other anatomical segments is mostly unknown in large multicenter clinical series. Genetic factors are believed to be important given that most large clinical series report a positive family history in approximately 10% of probands.