Cervical Dystonia (Spasmodic Torticollis) By Hector A Gonzalez-Usigli, MD, HE UMAE Centro Médico Nacional de Occidente Reviewed / Revised Feb 2022 | Modified Sep 2022 View Patient Education Symptoms and Signs Diagnosis Treatment Key Points Cervical dystonia is characterized by involuntary tonic contractions or intermittent spasms of neck muscles.