Spectrum of results and complications during coil embolization.

(A) Final framing coil position in aneurysm model #1, coil placement performed by an inexperienced operator, result graded as insufficient (3). (B) Erratic wire movement against the aneurysm wall of model #2 during aneurysm catheterization by one inexperienced operator. (C) Dislocation of the microcatheter from the aneurysm sac during placement of the framing coil, performed by an inexperienced operator. (D) Dislocation of the framing coil into the parent vessel during coil placement, performed by one inexperienced operator. (E) Coiling result of one inexperienced operator, showing a residual neck (Raymond-Roy Occlusion Classification II), arrow indicating coil prolapse into the ICA. (F) Coiling result of the most experienced operator, showing a residual neck (Raymond-Roy Occlusion Classification II).