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We report serial MR imaging and spectroscopy changes in a case of malignant transformation of low-grade oligodendroglioma. Proton MR spectroscopic imaging revealed elevated choline and decreased N-acetyl-aspartate, with lactate appearing after malignant transformation. On diffusion-weighted MR imaging, the tumor showed decrease in the apparent diffusion co-efficient. Anaerobic glycolysis and increased...
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