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A 120-kVp cerebral CTA with 60 mL of contrast agent in a 70-year-old woman. A and B, Volume-rendered digital subtraction CTA images show a true-positive aneurysm in the top of basilar artery (red arrow), which was confirmed by 3D-DSA (C) and a false-positive aneurysm in the left middle cerebral artery (yellow arrow), which was not evident in 2D-DSA.
