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Volume rendered 3DRA datasets in a 67-year-old man with a wide-neck 7-mm MCA aneurysm show a pretreatment angle δ between the M1 and superior M2 segments of 92.7°(A), which increased immediately to 99.6° after stent coiling (B), progressed to 109.2° at 3 months (C), and then to 129.9° at 13-month (D) follow-up imaging.
