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A, A 59-year-old woman with an incidentally discovered 12-mm right A1 segment anterior cerebral artery aneurysm. Immediate postembolization image shows residual aneurysm filling and coil loops protruding into the parent A1 segment. B, A 6-week surveillance angiogram shows interval obliteration of the aneurysm lumen and diminished flow within the adjacent A1 segment. C, A 13-month angiogram shows A1 parent-vessel occlusion and no aneurysm filling.
