Fusco, Matthew R.Salem, Mohamed M.Gross, Bradley A.Reddy, Arra S.Ogilvy, ChristopherKasper, EkkehardThomas, Ajith2016-05-022016Fusco, Matthew R., Mohamed M. Salem, Bradley A. Gross, Arra S. Reddy, Christopher S. Ogilvy, Ekkehard M. Kasper, and Ajith J. Thomas. 2016. “Preoperative Embolization of Extra-axial Hypervascular Tumors with Onyx.” Journal of Cerebrovascular and Endovascular Neurosurgery 18 (1): 12-18. doi:10.7461/jcen.2016.18.1.12. http://dx.doi.org/10.7461/jcen.2016.18.1.12.2234-8565http://nrs.harvard.edu/urn-3:HUL.InstRepos:26860084Objective: Preoperative endovascular embolization of intracranial tumors is performed to mitigate anticipated intraoperative blood loss. Although the usage of a wide array of embolic agents, particularly polyvinyl alcohol (PVA), has been described for a variety of tumors, literature detailing the efficacy, safety and complication rates for the usage of Onyx is relatively sparse. Materials and Methods We reviewed our single institutional experience with pre-surgical Onyx embolization of extra-axial tumors to evaluate its efficacy and safety and highlight nuances of individualized cases. Results: Five patients underwent pre-surgical Onyx embolization of large or giant extra-axial tumors within 24 hours of surgical resection. Four patients harbored falcine or convexity meningiomas (grade I in 2 patients, grade II in 1 patient and grade III in one patient), and one patient had a grade II hemangiopericytoma. Embolization proceeded uneventfully in all cases and there were no complications. Conclusion: This series augments the expanding literature confirming the safety and efficacy of Onyx in the preoperative embolization of extra-axial tumors, underscoring its advantage of being able to attain extensive devascularization via only one supplying pedicle.en-USEmbolizationEndovascularMeningiomaOnyxTumorJournal Article2016-05-0210.7461/jcen.2016.18.1.12