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In this study an in vitro multinuclear magnetic resonance spectroscopy (MRS) characterization of water soluble metabolites and of the lipid fraction obtained from 19 human gliomas (12 glioblastomas, 3 anaplastic astrocytomas, 2 anaplastic oligodendrogliomas and 2 oligodendrogliomas) with a total of 27 surgical specimens, is reported. Moreover, some in vivo H-1 MRS results are shown. The regional metabolic heterogeneity of glioblastomas, according to their morphological heterogeneity, is documented. For glioblastomas a specific in vitro H-1 MRS metabolite profile cannot be defined. Low and high grade oligodendrogliomas showed characteristic choline/creatine and alanine/creatine metabolite ratios. The spectroscopical characterization of histopathological factors concerning malignant gliomas is shown.

Eighteen patients affected by glial brain tumors were examined by localized single voxel magnetic resonance spectroscopy (1H MRS). For all patients histological diagnosis was obtained after stereotactic biopsy or surgical removal of the tumor. Histological nuclear atypia, tumor cellularity, necrosis, vascular proliferation and percentage of Ki-67 positive cells in the total cell populations were evaluated. It was found that some of the in vivo 1H MRS parameters were related to the histological features of the tumor. In particular, the Choi/Cri metabolite ratio obtained from the neoplastic tissues paralleled the Ki-67 cell proliferation index. For some of the patients 1H and 13C in vitro high resolution magnetic spectroscopy of surgical specimens was also carried out. 1H MRS of aqueous extracts from different biopsy specimens of the same tumor furnished fine biochemical information on intratumor heterogeneity. The degree of histological vascular proliferation of the tumor was correlated to the presence of cholesteryl esters in the 13C spectrum of the lipid fraction of surgical specimens.