Case 1, patient 1. Left unruptured MCA aneurysm in a 76-year-old woman. A, Subtracted angiography of the internal carotid artery shows a wide-neck MCA aneurysm. B, Subtracted angiography of the internal carotid artery at the end of the procedure shows a neck remnant. C, Subtracted angiography of the internal carotid artery at 3 months shows complete aneurysm occlusion. D, Subtracted angiography of the internal carotid artery at 12 months shows persistent aneurysm occlusion.