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Petrous Apex Meningioma

Last Updated: September 30, 2018

Resection of a Petrous Apex Meningioma via the Supracerebellar Transtentorial Approach

Petrous apex meningiomas are located along the anterior extent of the petrous temporal bone. These tumors originate at or above the internal acoustic canal (IAC) and impinge on cranial nerves (CNs) VII-VIII and the brainstem. As the tumor expands, it can invade the Meckel’s cave and subsequently impinge on CN V and the temporal lobe.

Meningiomas of the posterior petrous bone have been classified into four groups according to the modified Desgeorges and Sterkers classification: posterior petrous, meatus and IAC, petrous apex without invasion of the IAC, and cerebellopontine angle with invasion of the IAC. Most petrous apex meningiomas do not infiltrate the IAC.

Although these tumors are generally ben...