[Influences of high-field intraoperative magnetic resonance imaging on the extent of resection in low-grade gliomas].

OBJECTIVE: To evaluate the influences of high-field intraoperative magnetic resonance imaging (iMRI) on the extent of resection (EoR) in low-grade gliomas. METHODS: Fifty-nine patients with low-grade gliomas underwent microsurgeries under the guidance of high-field iMRI and functional neuro-navigation. The rates of gross total removal and EoR were recorded after initial and final iMRI scans and neurological performances were evaluated peri-operatively and at follow-up. RESULTS: iMRI and functional neuronavigation were successfully performed in all patients. Initial iMRI found that the rates of gross total removal were misestimated in 21 cases (35.6%). In 17 cases (28.8%), initial iMRI revealed resectable residual tumors and further resection achieved gross total removal in 8 cases (13.6%). iMRI boosted the level of EoR from 90% ± 15% to 94% ± 12% (P < 0.001) in all cases and from 78% ± 17% to 91% ± 12% in 17 cases undergoing further tumor resections. At 3-month follow-up, 2 cases (3.4%) developed neurological deficits. CONCLUSION: The combination of iMRI and functional neuronavigation helped maximize safe tumor resection in low-grade gliomas.