Figure 5a. Spontaneous regression of a cavernous sinus dural AVF with posterior drainage. (a) T2-weighted magnetic resonance (MR) image shows multiple flow voids in the posterior cavernous sinus (arrows). (b) Left external carotid arteriogram shows a cavernous sinus dural AVF with posterior drainage into the inferior and superior petrosal sinuses (arrows). (c) Follow-up MR image shows resolution of the flow voids.