FIG 4. Patient 12 with meningioma, after radiation therapy.

A and B, Nonenhanced (A) and gadolinium-enhanced (B) SE T1-weighted images. The image in B shows evidence of strong enhancement, except in the central region.

C, At 24 hours after ferumoxtran infusion, SE T1-weighted image shows strong ferumoxtran enhancement in the less gadolinium-enhancing central region and only minimal ferumoxtran enhancement in the surrounding intensely gadolinium-enhancing portion.