الفهرس 
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Abstract
Unilateral vocal fold paralysis (UVFP) is the commonest cause of glottal insufficiency. Patients usually presented with dysphonia as a major complaint and sometimes aspiration and can have a variable impact on patients quality of life. The larynx provides 3 important functions: airway protection, respiration and phonation which are affected by paralysis of one or both vocal folds. Patient symptoms persisted at least 6 months after the onset of paralysis with trial of voice therapy was done. Treatment includes (1) waiting for spontaneous improvement, (2) receiving voice therapy, and (3) undergoing phonosurgery. Medialization (Type-I) thyroplasty with or without arytenoid adduction, since its introduction in 1974, has become the gold standard for the treatment of dysphonia due to glottic incompetence. However, Type-I thyroplasty requires an external incision and considerable expense and resources. So that, injection laryngoplasty has been described to medialize or augment the vocal fold with various substances, including HA, radiesse, Bovine collagen, autologous collagen, fat, fascia, and Gelfoam paste. Each of these materials, however, also has certain disadvantages. The most common cause of this condition is iatrogenic especially after total thyroidectomy followed by idiopathic cause.