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FIG 1. Left vertebral angiography (arterial phase, lateral view) showing VGAM supplied from medial posterior choroidal artery and drained to an old embryonic falcine sinus (A). Panel B (internal carotid angiogram [venous phase, lateral view]) shows the venous drainage pattern of the patient after endovascular aneurysm embolization. Normal drainage of the internal cerebral vein (black arrow) to the median prosencephalic vein and then into the accessory embryonic falcine sinus (white arrow) is evident. Rotational 3D digital subtraction angiography with volume rendering, anteroposterior (C) and lateral (D) views, show the feeding artery from MPChA, MPChA aneurysm, and preaneurysmal stenosis. Greatly dilated old embryonic median prosencephalic vein and an associated hypoplastic left posterior cerebral artery are also clearly seen.
