Fig. 1.

Initial CT and MR imaging. (A) Noncontrast head CT depicts a deep left-frontal mass lesion isointense to gray matter with surrounding vasogenic edema and subfalcine herniation. (B) T2-weighted fluid-attenuated inversion recovery (FLAIR) MR imaging depicts the extent of edema to better advantage. (C) Postgadolinium T1-weighted MR imaging shows intense, homogeneous enhancement of the deep left-frontal tumor. (D) Diffusion-weighted imaging (DWI) shows increased signal in this region. (E) Apparent diffusion coefficient (ADC) image demonstrates foci of reduced signal (one indicated by black arrow) within the region of increased DWI signal indicating true restricted diffusion.