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(A) The 3 regions of interest were defined on the corresponding T1-weighted postcontrast images: (grey voxels) enhancing tumor, (black voxels) peritumoral tissue, and (white voxels) normal tissue on the contralateral side of tumor. (B) Typical MRS spectra were obtained from (left) the enhancing tumor and from (right) contralateral normal tissue. Tumor tissue is characterized by elevated Cho and decreased NAA.
