Fig 1.

Group 1 subject (low balloon position).

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

B, Same subject as in A. Intra-arterial digital subtraction angiogram, right anterior oblique view, demonstrating a wide-neck aneurysm (black arrow). Neck size is 5.3 mm.