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Metabolite ratios for Cho/Cr, NAA/Cr, and Cho/NAA. The difference between the histopathologic tumor grades is most pronounced in the Cho/NAA ratio. In the group of low-grade lesions, the maximum Cho/NAA level is 1.3, whereas in anaplastic tumors, the Cho/NAA ratio is at least 2.5 with a maximum value of 8.9 in a grade IV lesion
