Rupture of De Novo Anterior Communicating Artery Aneurysm 8 Days after the Clipping of Ruptured Middle Cerebral Artery Aneurysm

Rapidly developed de novo aneurysm is very rare. We present a rapidly developed and ruptured de novo anterior communicating aneurysm 8 days after the rupture of another aneurysm. This de novo aneurysm was not apparent in the initial 3-dimensional computed tomography and digital subtraction angiography. We reviewed the literature and discussed possible mechanisms for the development of this de novo aneurysm.