Value of spiral CT in patients with cricothyroid approximation

Cricothyroid approximation raises the vocal pitch by simulating contraction of the cricothyroid muscle with sutures. The aim of this study was to dete rmine the role of spiral CT in patients scheduled for cricothyroid approxim ation. 29 transsexual patients were examined with spiral CT prior to and af ter laryngoplastic surgery. CT findings were correlated with phonographic f indings in all patients. The average reduction of the cricothyroid distance was 6 mm (range 2-10 mm). Vocal pitch elevation was greatest in patients w ith the largest reduction of the cricothyroid distance. CT accurately deter mines the cricothyroid distance prior to and after surgery and is an ideal method for follow-up, especially in post-operative reversion towards a lowe r pitch. In addition, CT provides important data in determining the most ap propriate extent and site of intracordal intervention to achieve a desired pitch elevation.