Fig. 3.

Intraoperative photographs. In the initial surgery, only one small aneurysm was clipped because it was difficult to identify another one, which was in the most peripheral part of the left middle cerebral artery. A The aneurysm (arrow) in the bifurcation of the left middle cerebral artery was exposed. B Clipping was performed. In the second surgery, the peripheral aneurysm was identified using the Navigation System. C The aneurysm (arrow) was exposed. D Clipping was performed