|
FIG 3. 25-year-old woman with low-grade astrocytoma in right thalamus and subsequent invasion of the left thalamus via the massa intermedia.
A, FLAIR image shows hyperintense tumor without significant edema. Faint enhancement was seen on the T1-weighted image (not shown).
B, ADC map shows that the tumor (1) has slightly higher signal intensity than that of normal thalamus. Calculated ADC value of 110 x 10-3 mm2/s indicates low-grade malignant tumor, but this was not useful to differentiate it from other low-grade malignant tumors.
C, MR spectrum shows decreased NAA/Cho ratio (0.66) with prominent lactate peak. This is a common finding for primary malignant brain tumors, but does not allow us to make a subtype classification.
|