• Ping Li, Ruobing Qian, Chaoshi Niu, and Xianming Fu.
• a Department of Neurosurgery , Anhui Provincial Hospital Affiliated to Anhui Medical University, Anhui Province Key Laboratory of Brain Function and Brain Disease , Hefei , Anhui , P.R. China.
• Curr Med Res Opin. 2017 Apr 1; 33 (4): 621-630.

ObjectiveThis study addressed the benefit of intraoperative magnetic resonance imaging (iMRI) compared with conventional neuronavigation-guided resection in patients with gliomas.Research Design And MethodsThe Medline, PubMed, Cochrane, and Google Scholar databases were searched up to 26 September 2015. Randomized controlled trials (RCTs), two-arm prospective studies, and retrospective studies in patients with glioblastoma/glioma who had received surgical treatment were included.Main Outcome MeasuresThe primary outcome measures were the extent of tumor resection and tumor size reduction for using iMRI-guided or conventional neuronavigation-guided neurosurgery. Secondary outcomes included impact of surgery on 6 month progression-free survival (PFS), 12 month overall survival (OS) rates and surgical duration.ResultsWe found that iMRI was associated with greater rate of gross total resection (rGTR) compared with conventional neuronavigation procedures (3.16, 95% confidence interval [CI] 2.07-4.83, P < .001). We found no difference between the two neuronavigation approaches in extent of resection (EOR), tumor size reduction, or time required for surgery (P values ≥.065). Intraoperative MRI was associated with a higher rate of progression-free survival (PFS) compared with conventional neuronavigation (odds ratio, 1.84; 95% CI 1.15-2.95; P = .012), but the rate of overall survival (OS) between groups was similar (P = .799). Limitations of the study included the fact that data from non-RCTs was used, the small study population, and heterogeneity of outcomes across studies.ConclusionsOur findings indicate that iMRI more frequently resulted in more complete resections leading to improved PFS in patients with malignant gliomas.

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