FIG 2. Postembolization arteriograms of the left ICA A, B, and D, lateral views; C, anteroposterior view.

A, Nonsubtracted image. A 2/6-cm UltraSoft coil is placed into the aneurysmal sac with the distal end serving as an anchor (right arrow). The proximal part (3 cm) is placed through the stenosis (left arrow) and then densely folded into the neck. It conforms well to the shape of the neck (arrowheads), with no protrusion into the M1 segment. Asterisk indicates stagnation of contrast material.

B and C, Placement of this single coil (arrows in B) results in the complete disappearance of the aneurysm. In C, the coil loops at the base of the neck and is superimposed onto the lumen of M1 (arrow), but does not actually protrude into it.

D, Late-phase image demonstrate how the involved MCA territory is filled in retrograde fashion by the leptomeningeal collaterals (arrowheads).