FIG 2. 60-year-old woman with dementia.

A, Axial T2-weighted MR image shows hydrocephalus and a plethora of prominent subarachnoid vessels (arrows).

B and C, Lateral views of the arterial (B) and venous (C) phases of left occipital angiogram show a complex DAVF involving the distal transverse sinus with retrograde flow in an anomalous parietal dural venous sinus (arrow, B) and RLVD (arrows, C).

D, Lateral view of the venous phase of right internal carotid angiogram shows severe PPP.