Anti-Ri Associated Paraneoplastic Cervical Dystonia and Laryngospasm in a Patient with Nasopharyngeal Carcinoma.

Oromandibular dystonia and laryngospasm are defined as paraneoplastic syndromes of anti-Ri antibody. Herein, we report a 50-year-old woman admitted to the outpatient clinic with cervical contraction, speech and gait disturbance, and mental deterioration persisting for one year. She was diagnosed with undifferentiated nasopharyngeal carcinoma during further examination for two years of tinnitus and underwent radiotherapy. Her neurological symptoms started six months after radiotherapy. During this period, she underwent a tracheostomy due to a sudden laryngospasm. Anti-Ri antibody was positive in the paraneoplastic antibody screening. Her cervical dystonia and mental deterioration partially improved with intravenous pulse steroid and immunoglobulin therapies. However, the patient deceased due to aspiration pneumonia after six months. This rare clinical presentation, characterized by cervical dystonia, laryngospasm, spastic quadriparesis, and mental deterioration, should be considered anti-Ri antibody-associated paraneoplastic syndrome for patients with nasopharyngeal carcinoma.