Fig. 13.

Radiation necrosis. A 58-year-old male with left sphenoid wing meningioma extending into the left cavernous sinus and orbital apex (bracket). The left basifrontal region at that time was unremarkable. Follow-up imaging 2 years after receiving radiation now demonstrates several irregular rim-enhancing lesions in the left basifrontal region (arrows). There is no abnormal corresponding DWI signal. Follow-up imaging 5 years after radiation now demonstrates resolution of the irregular enhancing lesions in the left basifrontal region (arrowhead), confirming radiation necrosis