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Figure 1: (a) Preoperative CT scan of head showing diffuse SAH; (b) preoperative CT scan of head showing normal brainstem, without any hematoma; (c) DSA left ICA injection oblique views showing anterior communicating artery aneurysm; (d) DSA left vertebral artery injection showing the absence of any vascular malformation in the brainstem

Figure 1: (a) Preoperative CT scan of head showing diffuse SAH; (b) preoperative CT scan of head showing normal brainstem, without any hematoma; (c) DSA left ICA injection oblique views showing anterior communicating artery aneurysm; (d) DSA left vertebral artery injection showing the absence of any vascular malformation in the brainstem