Conclusion: It is the most important principal that dissection is performed along the correct interface and the tumor should be removed en bloc after it is devascularized.

• 结论：显微镜下沿正确的界面进行分离，先离断动脉后处理静脉，避免分块切除而力争全切，是减轻术中出血和避免神经功能损害的关键。