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Pretreatment digital subtraction angiography. (A, B) Left internal carotid artery (ICA) angiography, AP and lateral views. (C, D) Right ICA angiography, AP and lateral views. (E, F) Left vertebral artery (VA) angiography, AP and lateral views. (G) 3D rotational angiography of the left VA shows a feeder aneurysm on the right quadrigeminal artery (white arrowhead). (H) Cone-beam CT confirms the feeder aneurysm (white arrowheads).
