At edema and ischemia of perifocal brain tissue extent of carried out resection should be evaluated according to MRI data, because remaining tumor masses are diagnosed more precisely.

    To detect remaining tumor masses with the background of post-operative hemorrhage it is preferable to use NLS-research with SEA.

    According to results of NLS-researches and MRI in 11% of patients extent of carried out surgical intervention may be updated in comparison with intraoperative data.

    Accuracy of NLS-research by metatron 4025 hunter with SEA in evaluation of surgical intervention extent is 93%, accuracy of MRI – 86%. Combined application of these methods allowed us to make more accurate diagnosis in 96% of cases.