AdobeStock 44556861This surgery is used for clipping of an aneurysm. 

The surgeon makes an incision in the skin, the bone is exposed, part of the skull is cut and the bone flap is lifted. The exposed dura is opened. The blood vessel with the aneurysm is located.  The aneurysm is treated by placing a titanium clip around its base.  Then the surgeon will confirm that blood is still flowing normally in the vessels around the aneurysm. 

The dura is closed, the bone flap is replaced, and the skin flap is folded back and closed with sutures and surgical staples.