FIG 1. Images from the case of a 34-year-old man with a large grade II astrocytoma in the inferior frontal and parietal area. Differentiation between edema and tumor is unclear on all sequences.

A, Fast T2-weighted spin-echo image.

B, Contrast-enhanced T1-weighted spin-echo image. The stereotactic biopsy was performed in the area of faint contrast material uptake (arrow).

C, Diffusion-weighted echo-planar image acquired with x sensitizing gradient.

D, Diffusion-weighted echo-planar image acquired with y sensitizing gradient.

E, Diffusion-weighted echo-planar image acquired with z sensitizing gradient.

F, Tensor ADC map.

G, Lattice index map. The red/yellow areas represent high/medium anisotropy, and the blue/dark blue areas represent lower anisotropy