• Hirofumi Okada, Takao Hashimoto, Yujiro Tanaka, Hiroki Sakamoto, and Michihiro Kohno.
• Department of Neurosurgery, Tokyo Medical University, Nishi-Shinjuku, Shinjuku-ku, Tokyo, Japan. Electronic address: h-okada@tokyo-med.ac.jp.
• World Neurosurg. 2022 Jun 1; 162: e178-e186.

ObjectivePreoperative embolization for intracranial meningiomas can cause tumor necrosis, reduce intraoperative blood loss, and facilitate surgery. This study aimed to evaluate the efficacy of tumor embolization using Embosphere microspheres for skull base meningiomas and analyze postembolization plain computed tomography (CT) and magnetic resonance imaging (MRI) scans to identify findings that could potentially predict treatment response.MethodsBetween April 2014 and April 2020, 80 patients with skull base meningiomas presenting at our medical center underwent embolization with Embosphere microspheres. The effects of tumor embolization were evaluated through a comparison of postembolization plain CT and contrast-enhanced MRI.ResultsA total of 143 vessels (102 of 108 external carotid artery branches and 41 of 65 internal carotid artery branches) from 80 skull base meningiomas were embolized with Embosphere microspheres. Microspheres 100-300 μm in size were used in 2 cases, microspheres 300-500 μm in size were used in 12 cases, and microspheres 500-700 μm in size were used in 66 cases. Postembolization contrast-enhanced MRI showed reductions in enhancing lesions within the tumor in 55 of 80 cases. Postembolization plain CT scans showed high-density lesions within the tumor in 41 of 55 cases. Thus, reductions in enhancing lesions on postembolization contrast-enhanced MRI were statistically significantly associated with the presence of high-density lesions on postembolization plain CT (P < 0.001). Embolization-related neurological complications occurred in 3 cases.ConclusionsEmbosphere microspheres are user friendly and effective embolic materials for the embolization of skull base meningiomas. Postembolization contrast-enhanced MRI and plain CT findings may be useful for evaluating the effects of tumor embolization.Copyright © 2022 Elsevier Inc. All rights reserved.

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