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Figure 4b. Right frontal low-grade oligodendroglioma (WHO grade II) in a 35-year-old man. (a) FLAIR image shows a nonenhancing T2 hyperintense mass (similar appearance observed on postcontrast T1-weighted MR images, not shown here). (b) Axial ADC map shows facilitated diffusion. (c) Short-echo MR proton spectrum shows an elevated myoinositol (mI) peak (at 3.55 ppm). Cho = choline, Cr = creatine.