Clinical and laboratory characteristics of focal laryngeal dystonia: Study of 110 cases

Spastic dysphonia is a syndrome often, producing a strain‐strangle voice. We have previously classified most of these patients as having focal laryngeal dystonia, a disorder of central motor processing. In a study of 1,280 cases of dystonia registered at the Dystonia Clinical Research Center at the Columbia‐Presbyterian Medical Center, we found 110 patients who had vocal cord involvement.