The speaking fundamental frequency of men is high-pitched in childhood. At the time of the second pubescent sexual orientation, the frequency usually decreases because of the effects of androgen. However, the high-pitched voice of childhood may last without successful low-pitched change during puberty. Thus, there are rare cases of adults with a high-pitched boyish voice. This condition is referred to as mutational dysphonia.Voice therapy is usually effective in cases of mutational dysphonia, however, it could fail in some cases. We performed type3 thyroplasty (TP3) for cases of mutational dysphonia in which voice therapy was not effective.With TP3, the tension of the vocal folds decreases, and the voice becomes low-pitched. We report the results of treatment using a sound and movie.
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