Fig. 2. A : Operation photograph showing trapping of the dissected segment and side-to-side anastomosis. The aneurysm (not shown) is hidden behind the rootlets (arrow) of low cranial nerve. Whitish discoloration of the proximal segment of the dissection is also shown. B : Illustration showing the "closing omega" anastomosis, canalling of the proximal and distal caudal loops of a single artery. C : Reconstruction of the three-dimensional angiography at the first postoperative day showing successful obliteration of the aneurysm and intact patency of distal flow. D : CT at the 14th postoperative day shows no evidence of cerebral infarction.