fig 3.

Contrast-enhanced SPGR (34/3/1) MR and MRS (16 × 8 × 8, 1000/144/1) data from a patient with oligoastrocytoma.

A, MR location and the spectrum for a biopsy that yielded 75% oligoastrocytoma. Note the elevated choline (1.8 times normal) and absent NAA levels.

B, MR location and the spectrum for a biopsy that correlated with the pathologic finding of necrosis, astrogliosis, and white matter. Note the minimal choline, creatine and NAA resonances in this spectrum. Although the image intensity is similar to the region in A, significant spectral differences were observed with elevated choline/normal choline levels correlated with the presence of tumor.