Abstract
In cases of difficult aneurysms the temporary occlusion of blood flow makes the operation easy; however, ischemic damage of the brain must always be considered. Temporary clipping of the parent artery is easy, but ischemic damage may be severe.
On the other hand, a tentative clip which is put on the aneurysm either partially or totally, has the following merits:
1) Preparation of the aneurysm is easy and safe.
2) There is less ischemic damage.
But there are the following demerits:
1) The part of the aneurysm on which a tentative clip is put should be prepared.
2) At the time of tentative clipping the back side of the aneurysm cannot be seen.
Temporary clipping and tentative clipping, each has its own merits and demerits.
We have to approach aneurysms on the base of sufficient knowledge.
