Figure 4.

Internal carotid angiography in lateral view (A: arterial phase; B; early venous phase, C: late venous phase). Posterior and anterior ethmoidal network (A: arrowheads) are partially opacifying the superior ophthalmic vein (A: arrow), with hyperaemia and venous stagnation (B: star). This supported the diagnosis of arteriovenous shunt with thrombosis of the draining vein. Anastomotic veins (B: small arrows) look congestive. The cavernous sinus is patent and drains the superficial middle cerebral vein (C: double arrows). Note the two cortical cerebral microarteriovenous malformations (A: empty arrows).