Retrosigmoid Suprameatal Approach for the Resection of a Petrotentorial and a Petroclival Meningioma: 3-Dimensional Operative Video.

Abstract

Posterior skull base meningiomas pose a formidable surgical challenge because of their proximity to critical neurovascular structures and the narrow corridor available for their resection. While radiosurgery may be an effective treatment alternative, 1 microsurgery remains superior in addressing associated compressive symptoms. 2 Several approaches have been described to access these lesions, with varying degrees of exposure to the petroclival region. 3-7 The choice of the optimal approach depends on different factors related to the tumor morphological features and the surgeon's preference and experience. The retrosigmoid approach is a straightforward procedure compared with other more laborious skull base approaches to the petroclival region. Its described intradural extensions contribute to its high versatility for posterior skull base tumors. One of these extensions involves drilling the suprameatal tubercle, significantly increasing exposure and maneuverability for tumors located medial to the internal acoustic canal. 8 The semisitting position adds further value as it allows for a gravity-assisted clearance of blood and debris, achieving a clear surgical field. 9 We present 2 patients suffering from trigeminal neuralgia secondary to a petrotentorial and a petroclival meningioma. Given the location of both tumors predominantly medial and superior to the internal acoustic canal, resection was carried out through a retrosigmoid suprameatal approach with the patient in a semisitting position. Relevant anatomic and surgical considerations are discussed and illustrated in this 3-dimensional operative video. Gross total resection was achieved, and both patients remained neurologically intact and pain-free at long-term follow-up. Both patients consented to the procedure and to the publication of their image.