Abstract
We report a method to expose an aneurysm on the posterior aspect of the internal carotid artery in the operation field with a pterional approach. A 47-year-old woman had an internal carotid artery aneurysm at the junction with the posterior communicating artery. The aneurysm, which was not visualized in the pterional transsylvian route, was successfully exposed by rotating the internal carotid artery by pushing a clip-head of the temporary clip that had been placed at the proximal segment of the parent artery. This method proved to be very effective to expose the aneurysm neck and also to isolate the posterior communicating artery free from the aneurysm.
