Results: Median FA of tumor border and median FA of ratio tumor border / normal white matter of the contralateral hemisphere were 0, 234 + 0, 200 and 0, 721 + 0, 608 for grade 2 versus 0, 147 + 0, 053 and 0, 387 + 0, 138 for grade 3 (p=0, 038 and 0, 006).