부분 미로 절제술을 이용한 추체-경사대 접근법 11례： 수술전후의 청력변화 비교

Background: Among many modalities for treatment of petrous-clivus lesion, partial labyrinthectomy approach is a method for hearing preservation. Objects and Methods: We reviewed 10 patients of skull base tumor and 1 patient of congenital cholesteatoma. Pure tone audiometry was checked before and 3 months after the surgery. Results: The lesions treated included 6 petroclival meningiomas, 3 clivual neoplasms (2 meningioma and 1 cholesteatoma) and 2 Cerebellopontine angle neurogliomas. Sacrificed semicircular canals were 3 cases of superior and lateral canals and 8 cases of superior and posterior canals. With exception of 4 cases of scale-out, average bone conduction decreased from preoperative 21.2 dB to postoperative 50.4 dB. Average speech discrimination score decreased to 32.7%. 2 cases preserved their serviceable hearing level. Conclusion: Partial labyrinthectomy approach can be helpful for patients who want to maintain normal hearing level with further modification and efforts. (J Clinical Otolaryngol 2000;11:133–136)