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Figure 1: (a) Left internal carotid artery angiogram showing a wide-necked aneurysm of the left posterior communicating artery, and the coil mass seems stable after placement of the first complex coil; (b) Angiogram after inserting the second coil showing most of the coil mass, together with the microcatheter, prolapsed into the parent artery; (c) Subsequent unsubtracted angiogram of the right internal carotid artery showing the migration of the coil mass to distal internal carotid artery and middle cerebral artery, causing obvious flow compromise of the left middle cerebral artery; (d) Postoperative CT angiogram showing the patency of both the A2 and middle cerebral artery

Figure 1: (a) Left internal carotid artery angiogram showing a wide-necked aneurysm of the left posterior communicating artery, and the coil mass seems stable after placement of the first complex coil; (b) Angiogram after inserting the second coil showing most of the coil mass, together with the microcatheter, prolapsed into the parent artery; (c) Subsequent unsubtracted angiogram of the right internal carotid artery showing the migration of the coil mass to distal internal carotid artery and middle cerebral artery, causing obvious flow compromise of the left middle cerebral artery; (d) Postoperative CT angiogram showing the patency of both the A2 and middle cerebral artery