Fig 3. A 67-year-old woman admitted with grade IV SAH, comatose and ventilated. CT scan showed diffuse subarachnoid blood. A–C, Right internal carotid artery angiogram in 3 projections fails to demonstrate an aneurysm. Note filling of both A2s and A1s. D, Posterior view of 3DRA depicts a 1.6-mm anterior communicating artery aneurysm (arrow). This aneurysm was clipped 1 week later.