Other skull-base tumors.

Therapeutic policy and radiosurgical results for nonvestibular schwannomas and chordomas are reported. Fourteen patients with nonvestibular schwannomas treated with marginal doses of 12-15 Gy were followed for 5-13 years. All patients except one were stable and did not require additional treatments. Seven patients with chordomas were treated with marginal doses of 14-20 Gy. Five of them showed unchanged or decreased size of tumors during the follow-up of 4.5-7 years. Two patients required a second treatment and 1 died due to tumor progression outside of the treatment volume. No adverse effects were experienced in any of these patients. Gamma knife radiosurgery is an effective treatment for nonvestibular schwannomas and chordomas. However, multisession radiosurgery may be required for aggressive chordomas.