结论枕下乙状窦后经内听道入路的听神经显微手术，能够取得较好的肿瘤全切除率和面听神经功能保留率。
Conclusion Undergoing retrosigmoid approach one can succeed to get hign rate of total acoustic neuroma removal, facial and hearing preservation.
方法：应用枕下外侧扩大入路切除枕大孔脑膜瘤11例。
Methods: Eleven cases with the foramen magnum meningioma were operated by using posterior approach with lateral extension.
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