Fig 2. One-year follow-up of a 46-year-old man who underwent clipping of an aneurysm of the right middle cerebral artery with 2 cobalt-alloy clips. A, Subtraction CTA. B, Conventional CTA. C, 3D DSA with clips. D, 3D DSA without clips. Subtraction CTA (A) and 3D DSA (C and D) represent re-expansion of the aneurysm (arrows). Visualizing the aneurysm on conventional CTA (B) is complicated by a large artifact arising from the clips.