Figure 1a. Drawings (a = lateral view, b = anteroposterior view) illustrate the most common locations of dural AVFs: 1 = cavernous sinus (CS) (20%-40% of cases), 2 = transverse-sigmoid sinus (TS, SS) (20%-60%), 3 = tentorium (12%-14%), 4 = superior sagittal sinus (SSS) (8%), and 5 = anterior fossa (2%-3%). IPS = inferior petrosal sinus, ISS = inferior sagittal sinus, JV = jugular vein, MS = marginal sinus, OS = occipital sinus, SPS = superior petrosal sinus.