Abstract：
The presigmoid approach classically includes the ligature and section of the superior petrosal sinus to get a wider visibility window to the antero-lateral brainstem surface. In some cases, the separation of this venous structure should not be performed.
We present our experience getting safely to a pontine cavernous malformation through a conventional mastoidectomy presigmoid approach preserving an ingurgitated superior petrosal sinus because the association with an abnormal venous drainage of the brainstem.
When sectioning the superior petrosal sinus in classical presigmoid approaches is contraindicated, its preservation could also offer good surgical corridors to get to small-medium anterior and lateral brainstem cavernous malformations.
We present our experience getting safely to a pontine cavernous malformation through a conventional mastoidectomy presigmoid approach preserving an ingurgitated superior petrosal sinus because the association with an abnormal venous drainage of the brainstem.
When sectioning the superior petrosal sinus in classical presigmoid approaches is contraindicated, its preservation could also offer good surgical corridors to get to small-medium anterior and lateral brainstem cavernous malformations.
摘要：
背景：乙状窦入路传统上包括结扎上岩窦和部分，以获得更宽的可见窗口到前外侧脑干表面。在某些情况下,不应进行该静脉结构的分离。
方法：我们介绍了我们的经验，通过传统的乳突切除术治疗脑桥海绵状海绵状畸形，并保留了一个不完整的岩上窦，因为这与脑干静脉引流异常有关。
结论：当在经典的乙状窦入路中切开岩上窦是禁忌的，它的保存还可以提供良好的手术通道，以到达中小型前脑干海绵状畸形和外侧脑干海绵状畸形。
方法：我们介绍了我们的经验，通过传统的乳突切除术治疗脑桥海绵状海绵状畸形，并保留了一个不完整的岩上窦，因为这与脑干静脉引流异常有关。
结论：当在经典的乙状窦入路中切开岩上窦是禁忌的，它的保存还可以提供良好的手术通道，以到达中小型前脑干海绵状畸形和外侧脑干海绵状畸形。
