Cerebellopontine Meningioma

Resection of a Lateral Petrous/Cerebellopontine Angle Meningioma Cerebellopontine (CP) angle tumors account for about 10% of all intracranial tumors, and approximately 6 to15% of CP angle tumors are meningiomas. These tumors typically originate from the dura of the posterior surface of the petrous pyramid lateral to cranial nerve (CN) V. Cushing and Eisenhardt originally noted in 1938 that these tumors “simulate acoustic neuromas.”  The point of origin of the tumor establishes the resultant distorted anatomy of the adjacent critical neurovascular structures. Because the origin of most CP angle meningiomas is posterior to cranial nerves (CNs) V, VII/VIII, IX, and X, these nerves are displaced anteriorly and often separated by an intact arachnoid membrane. However, since these structures are within the blind spot of the surgeon and identified late during dissection, they are vulnerable to operative injurious maneuvers. Adjacent, medially displaced vascular structures include the basi...

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