Fig 5.

Right transverse sigmoid sinus DAVFs (type I) with a localized shunted venous pouch at the transverse-sigmoid junction. A, Right external carotid angiography shows DAVFs at the transverse-sigmoid junction. The DAVFs are fed by the right occipital artery, the posterior auricular artery, the posterior convexity branch, and the petrosal branch of the middle meningeal artery and drain antegradely into the sigmoid sinus. B, Axial reformatted images of DSA of the right external carotid artery show a shunted pouch (white arrow) that is located medial to the transverse-sigmoid junction. The shunted pouch is fed by the petrosal branch (PB) and the posterior convexity branch (Post B) of the middle meningeal artery, the posterior auricular artery (PAA), and the transosseous branches (TOB) of the occipital artery (OA). The AVFs disappeared following selective transvenous embolization (not shown).