FIG 1. 63-year-old woman with a recurrent anaplastic astrocytoma verified by surgical resection.

A, Contrast-enhanced T1-weighted MR image (690/14/1; section thickness, 5 mm) shows a focally enhancing area (arrow) with a surrounding nonenhancing zone of low intensity and mass effect in the right frontal lobe.

B, Anaplastic astrocytoma appears as an area of hyervascularity (arrow) on rCBV map (normalized rCBV ratio, 4.45).

C, Histologic specimen shows densely accumulated tumor cells (hematoxylin-eosin, original magnification x 200).