Table 4.

A benign tumor or a successfully treated malignant tumor show brighter signal on low b-value DWI and ADC images

	Diffusion	DWI low b-value	DWI high b-value	ADC map
Benign Malignancy with successful Tx	Relatively free
Malignancy Recurrence	Restricted

ADC, apparent diffusion coefficient; DWI, diffusion-weighted imaging.

However, in recurrence of malignancy, because of the restricted diffusion, the ADC map will show a dark signal and the bright signal is most pronounced on high b-value DW image.