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Figure 6a. Bihemispheric gliomatosis cerebri in a 53-year-old woman. (a) FLAIR image shows a T2 hyper-intense nonenhancing mass involving both hemispheres (similar appearance observed on postcontrast T1-weighted MR images, not shown here). (b) On the axial rCBV map, the rTBV is lower than that of normal brain tissue (ratio = 0.83). (c) Short-echo MR proton spectrum shows elevated levels of creatine (Cr) (at 3.0 ppm) and myoinositol (mI) (at 3.55 ppm), a reduced level of NAA (at 2.02 ppm), and a mildly elevated level of choline (Cho) (at 3.2 ppm).
