fig 5.

Fibrous meningioma in the left convexity.

A, On a T2-weighted image, tumor intensity is mildly high and edema is present anterior to the tumor.

B, The tumor enhances homogeneously.

C, On DWI, the peripheral portion of the tumor is moderately hyperintense and the central portion is isointense. Peritumoral edema is mildly high in intensity.

D, Regions of interest are shown on the ADC map. The ADC values are 0.83, 0.74, 0.71, 0.67, and 0.57, and the averaged ADC value is 0.70. Some areas of apparent restricted diffusion in the tumor probably reflect T2 shine-through effect, because ADC values in these areas are not low and the signals in those areas show high intensity on the T2-weighted image.