Retrosigmoid Intradural Suprameatal Approach for Petroclival Meningioma

Abstract

Background Anterior transpetrosal approach and the combined transpetrosal approach are the major surgical approaches for petroclival meningiomas. However, anterior petrosectomy is not preferable in cases with postoperative venous drainage disorder of the sylvian vein due to anatomical variations. Here we present a case of the successful removal of petroclival meningioma by the retrosigmoid intradural suprameatal approach (RISA).

Case Presentation The patient was a 59-year-old woman with incidentally detected right petroclival meningioma. Although she had no neurological deficit, the tumor manifested with gradual growth on annual magnetic resonance imaging (MRI) during an 8-year follow-up. Three-dimensional computed tomography venography (3D–CTV) revealed sphenobasal type of the sylvian vein throughout the lateral side of the foramen ovale. Because the suprameatal tubercle was an obstacle to observe the Meckel's cave, RISA was selected for complete tumor excision. RISA could provide an excellent operative field around the Meckel's cave to confirm the remnant tumor. Postoperative MRI showed no evidence of the tumor, and the patient was discharged without any neurological deficit.

Conclusion RISA can provide a favorable operative field for petroclival meningioma, particularly for cases with high risk of postoperative complications related to the sylvian vein.

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Keywords

petroclival meningioma - retrosigmoid approach - retrosigmoid intradural suprameatal approach - suprameatal tubercle - anterior transpetrosal approach - sphenobasal vein - sylvian vein