FIG 1. Group 1 subject (low balloon position).

A, Anteroposterior (AP) spot film obtained during aneurysm creation surgery. The RCCA is opacified with the elastase/iodinated contrast mixture. Note that the inflated balloon is completely in right subclavian artery and brachiocephalic artery (black arrow).

B, Intra-arterial digital subtraction angiogram, right anterior oblique view, demonstrating a wide-necked aneurysm (white arrow). Neck size is 5.3 mm.