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FIG 4. 22-year-old man with oligodendroglioma involving the left temporal lob and basal ganglia region.
A, FLAIR image shows hyperitense mass without significant edema. No contrast enhancement was present on the T1-weighted image (not shown).
B, ADC map shows that the tumor (1) has a heterogeneous pattern and higher signal intensity than that of the contralateral basal ganglia region. Its calculated ADC value is 118 x 10-3 mm2/s and strongly suggests low-grade malignant or benign tumor.
C, MR spectrum shows mild decrease in both NAA and Cho (NAA/Cho = 0.72) with small lactate peak. This spectrum helps to differentiate this tumor from benign tumors but is not useful to distinguish the histologic subtypes.
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