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FIG 2. 51-year-old man with high-grade astrocytoma in the left periventricular white matter.
A, T1-weighted image shows heterogeneous contrast enhancement of the tumor with extensive peritumoral edema.
B, ADC map shows that the tumor (1) and adjacent tumor (2) nearly isointense with cerebral white matter (2). This tumor’s calculated ADC value is 87 x 10-3 mm2/s, which helps to differentiate it from low-grade malignant tumors, but not from metastasis.
C, Proton MR spectrum shows prominent decrease in NAA and increase in Cho (NAA/Cho = 0.19) and lactate (lactate/Cr = 0.28). Absence of prominent lipid peak with low lipid/Cr ratio helps to differentiate this tumor from metastasis.
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