FIG 2. Low-grade astrocytoma (grade I/III).

A, T2-weighted image (3158/119) demonstrates bifrontal abnormalities in signal intensity centered primarily in the left frontal lobe.

B, Contrast-enhanced T1-weighted image (600/14/1) demonstrates an ill-defined focus of enhancement.

C, rCBV map demonstrates a few foci of mildly elevated perfusion (arrow), which are in a location different from the region of maximal enhancement in B.

D, SD25 color map suggests low permeability throughout the lesion.