• Yukinori Akiyama, Shunya Ohtaki, Katsuya Komatsu, Kentaro Toyama, Rei Enatsu, Takeshi Mikami, Masahiko Wanibuchi, and Nobuhiro Mikuni.
• Department of Neurosurgery, School of Medicine, Sapporo Medical University, Sapporo, Hokkaido, Japan.
• World Neurosurg. 2017 Sep 1; 105: 14-19.

ObjectiveTo evaluate motor function during neuroendoscopic resectioning of deep-seated brain tumors using endoscopically guided depth electrodes.MethodsFor 12 cases of thalamic tumors, including high-grade gliomas, germinomas, and malignant lymphomas, depth electrodes were inserted using endoscopic guides between the tumor and the pyramidal tract in the thalamus. Motor-evoked potentials (MEPs) were continuously recorded during neuroendoscopic resectioning of the tumors.ResultsMonitoring of MEP responses using depth electrodes in all 12 cases was successful. The minimum stimulus intensity threshold required to induce MEP responses was 3 mA. Gross total or subtotal resections were successful with this technique for all patients with glioma. No additional neurologic impairments were found after surgery in any of the cases.ConclusionsContinuous MEP measurement using depth electrodes can serve as a new monitoring technique for endoscopic resectioning of deep-seated brain tumors.Copyright © 2017 Elsevier Inc. All rights reserved.

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