FIG 2. Images in a 42-year-old man with pathologically confirmed gliomatosis cerebri.

Left, T2-weighted (3400/119) MR image demonstrates a region of signal intensity abnormality in the right periventricular white matter.

Middle, Contrast-enhanced axial T1-weighted (600/14) image demonstrates subtle evidence of contrast enhancement.

Right, Color overlay rCBV map reveals that the areas corresponding to signal intensity abnormality on the T2-weighted image do not demonstrate increased perfusion.