[Phonosurgery treatment options in male to female and female to male transsexuals.].

The voice is an important part of human identity. The voice is susceptible to impact of hormons mainly sexual hormons. The larynx is one of secondary sex characacteristics. Disorders of voice pose serious obstacle to full social integration in male to female and female to male transsexuals. The causes of transsexuality are still a matter of considerable debate. Now it is considered that, big nucleus suprachiasmaticus in the hypothalamus may be a cause of transsexuality. The aim of phonosurgery in transsexual patients is to gain acceptable voice by the patients. Proper preoperative assessment by the use of HRCT 3D imaging of the larynx and phoniatric counseling yields realistic postoperative results and verify patients expectations.