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The authors report a case of fusiform aneurysm in the proximal anterior cerebral artery(ACA). A 44-year-old woman presented with severe headache after subarachnoid hemorrhage. The right carotid angiography demonstrated a fusiform aneurysm in the A1 segment of right ACA with vasospasm. Clipping of a fusiform right A1 aneurysm was performed via the right pterional approach. The postoperative cerebral angiography demonstrated complete occlusion of the fusiform aneurysm and moderate degree of vasospasm with preservation of A1 segment. The postoperative course was uneventful. We report a case of fusiform aneurysm of A1 segment that was successfully clipped with the fenestrated aneurysmal clip. Key words:Aneurysm;Fusiform;Anterior cerebral artery;Fenestrated clip.