Reportage in the interventional neuroradiology service in Pasteur 2 Hospital, Nice, France. Treating a cerebral aneurysm through embolization. This endovascular treatment consists of introducing a catheter into the brain and filling the aneurysm with platinum coils in order to clot it and prevent it splitting. The embolization is carried out under fluoroscopic guidance. On the screen an x-ray of the skull showing another aneurysm that has already been treated.