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The authors report a case of de novo right middle cerebral artery and left anterior cerebral artery aneurysms in a 52-year-old woman, which were documented angiographically 8 years after the initial left middle cerebral artery aneurysm rupture. She had a history of hypertension and had a familial intracranial aneurysm (her sister had a right A2 aneurysm and brother had a right middle cerebral artery bifurcation aneurysm. We conclude that postoperative follow-up cerebrovascular imaging study should be performed periodically with a more frequent cycle, especially in patients with familial intracranial aneurysms to rule out the subsequent development of de novo aneurysms. Key words:Familial aneurysm;Subarachnoid hemorrhage.