[Diagnostic and therapeutic difficulties in laryngeal dystonia].

Spasmodic dysphonia is a focal laryngeal dystonia. It presents as: adductor spasmodic dysphonia with the strain-strangle voice; abductor spasmodic dysphonia with whispering voice and breathy breaks in connected speech; and adductor respiratory dystonia with paradoxical vocal fold movements and stridor. It is most commonly treated by the intramuscular injection of botulinum toxin. In this article, the authors discuss difficulties in making diagnosis and treatment in patients with laryngeal dystonia concerning their own cases.