Adductor spasmod.ic dysphonia is a vocal disorder of uncertain etiology with no satisfactory long-term treatment-result. Recently injecrton of Botulinum toxin (BOTOX) into the thyroarytenoid muscle has been used as an effective temporary treatment. In this experiment, 9 partents with adductor spasmodic dysphonia (SPD) were studicd and injected percutaneously the Bonlinum toxin with dose of inje...